Alkali-free glass plate

ABSTRACT

The present invention provides an alkali-free glass sheet, including as a glass composition, in terms of mol %, 60% to 74% of SiO 2 , 6% to 20% of Al 2 O 3 , 0% to 9% of B 2 O 3 , 1% to 13% of MgO, 1% to 13% of CaO, 0% to 7% of SrO, 0% to 8% of BaO, and 0% to less than 1.0% of Y 2 O 3 +La 2 O 3 , being substantially free of an alkali metal oxide, and having a strain point of 650° C. or more.

TECHNICAL FIELD

The present invention relates to an alkali-free glass sheet, and more particularly, to an alkali-free glass sheet suitable as a substrate for forming a TFT circuit in a flat panel display, such as a liquid crystal display or an OLED display, or as a carrier glass for holding a resin substrate for forming the TFT circuit.

BACKGROUND ART

As is well known, a liquid crystal panel or an OLED panel includes a thin film transistor (TFT) for driving control.

As a thin film transistor configured to drive a display, amorphous silicon, low-temperature polysilicon, high-temperature polysilicon, and the like have been known. In recent years, along with the spread of large liquid crystal displays, smartphones, tablet PCs, and the like, there is an increasing need for higher resolution of a display. A low-temperature polysilicon TFT can meet this need, but a high-temperature film forming process of from 500° C. to 600° C. is involved. However, a related-art glass sheet has large thermal shrinkage before and after the high-temperature film forming process, and hence pattern deviation of the thin film transistor is caused. Accordingly, in order to increase the resolution of the display, a glass sheet with low thermal shrinkage is required. In recent years, a further increase in definition of the display has been investigated. In this case, a further reduction in thermal shrinkage of the glass sheet is required.

CITATION LIST

Patent Literature 1: JP 5769617 B2

SUMMARY OF INVENTION Technical Problem

As a main method of reducing the thermal shrinkage of the glass sheet, two methods are given. A first method is a method involving holding the glass sheet in advance at a temperature around a heat treatment temperature of the film forming process to anneal the glass sheet. In this method, glass undergoes structural relaxation and shrinks at the time of annealing, and hence a thermal shrinkage amount in the subsequent film forming process at high temperature can be suppressed. However, this method entails an increase in number of manufacturing steps and a longer manufacturing time, resulting in a rise in manufacturing cost of the glass sheet.

A second method is a method involving increasing the strain point of the glass sheet. In an overflow down-draw method, glass is generally cooled from a melting temperature to a forming temperature in a relatively short time. Under the influence of this, the fictive temperature of the glass sheet is increased, and the thermal shrinkage of the glass sheet is increased. In view of the foregoing, when the strain point of the glass sheet is increased, the viscosity of the glass sheet at a heat treatment temperature of the film forming process is increased, with the result that structural relaxation hardly proceeds. As a result, the thermal shrinkage of the glass sheet can be suppressed. Moreover, as the heat treatment temperature of the film forming process becomes higher, an increase in strain point has a higher effect on a reduction in thermal shrinkage. Accordingly, in the case of the low-temperature polysilicon TFT, it is desired that the strain point of the glass sheet be increased to the extent possible.

For example, in Patent Literature 1, there is disclosed that the strain point of a glass sheet is increased by reducing the content of B₂O₃ in a glass composition. Further, in Patent Literature 1, there is disclosed that a reduction in denitrification resistance caused by a low B₂O₃ content is avoided by introducing Y₂O₃ and/or La₂O₃ into the glass composition. However, Y₂O₃ and La₂O₃ are rare earth elements, and hence raw material cost is high, resulting in a rise in manufacturing cost of the glass sheet.

The present invention has been made in view of the above-mentioned circumstances, and a technical object of the present invention is to provide an alkali-free glass sheet which has a high strain point and enables a reduction in manufacturing cost.

Solution to Problem

The inventors of the present invention have made extensive investigations, and as a result, have found that the above-mentioned technical object can be achieved by strictly restricting the contents of components and restricting a strain point to a predetermined value or more. The finding is proposed as the present invention. That is, according to one embodiment of the present invention, there is provided an alkali-free glass sheet, comprising as a glass composition, in terms of mol %, 60% to 74% of SiO₂, 6% to 20% of Al₂O₃, 0% to 9% of B₂O₃, 1% to 13% of MgO, 1% to 13% of CaO, 0% to 7% of SrO, 0% to 8% of BaO, and 0% to less than 1.0% of Y₂O₃+La₂O₃, being substantially free of an alkali metal oxide, and having a strain point of 650° C. or more. Herein, the “Y₂O₃+La₂O₃” refers to the total content of Y₂O₃ and La₂O₃. The “substantially free of an alkali metal oxide” refers to a case in which the content of an alkali metal oxide (Li₂O, Na₂O, K₂O) in the glass composition is less than 0.5 mol % (desirably less than 0.1 mol %). The “strain point” refers to a value measured based on a method of ASTM C336.

In addition, it is preferred that the alkali-free glass sheet according to the one embodiment of the present invention have a content of SrO+BaO of from 0 mol % to 3 mol %. Herein, the “SrO+BaO” refers to the total content of SrO and BaO.

In addition, it is preferred that the alkali-free glass sheet according to the one embodiment of the present invention have a strain point of 700° C. or more.

In addition, it is preferred that the alkali-free glass sheet according to the one embodiment of the present invention have a Young's modulus of 79 GPa or more. Herein, the “Young's modulus” may be measured by a flexural resonance method.

In addition, it is preferred that the alkali-free glass sheet according to the one embodiment of the present invention have a thermal expansion coefficient of from 30×10⁻⁷/° C. to 45×10⁻⁷/° C. With this configuration, a situation in which the glass sheet has a local dimensional change owing to temperature variations in a film forming process at high temperature can be suppressed.

In addition, it is preferred that the alkali-free glass sheet according to the one embodiment of the present invention have a temperature at a viscosity at high temperature of 10^(2.5) dPa·s of 1,600° C. or less. With this configuration, a reduction in melting cost can be achieved.

DESCRIPTION OF EMBODIMENTS

An alkali-free glass sheet of the present invention comprises as a glass composition, in terms of mol %, 60% to 74% of SiO₂, 6% to 20% of Al₂O₃, 0% to 9% of B₂O₃, 1% to 13% of MgO, 1% to 13% of CaO, 0% to 7% of SrO, 0% to 8% of BaO, and 0% to less than 1.0% of Y₂O₃+La₂O₃, and is substantially free of an alkali metal oxide. The reasons why the contents of the components are limited as described above are described below. In the descriptions of the contents of the components, the expression “%” represents “mold”, unless otherwise specified.

SiO₂ is a component which forms a glass skeleton, and is also a component which increases a strain point. Accordingly, the content of SiO₂ is preferably 60% or more, 62% or more, 64% or more, or 64% or more, particularly preferably 66% or more. Meanwhile, when the content of SiO₂ is too large, a viscosity at high temperature is increased, and thus meltability is liable to be reduced. Accordingly, the content of SiO₂ is preferably 74% or less, 72% or less, or 70% or less, particularly preferably 68% or less.

Al₂O₃ is a component which forms the glass skeleton, and is also a component which increases the strain point. Further, Al₂O₃ is a component which suppresses phase separation. Accordingly, the content of Al₂O₃ is preferably 6% or more, 8% or more, or 10% or more, particularly preferably 12% or more. Meanwhile, when the content of Al₂O₃ is too large, the viscosity at high temperature is increased, and thus the meltability is liable to be reduced. Accordingly, the content of Al₂O₃ is 20% or less, 18% or less, or 16% or less, particularly preferably 14% or less.

B₂O₃, which is an optional component, is a component which remarkably improves the meltability. Accordingly, the content of B₂O₃ is preferably 0% or more, 0.01% or more, 0.1% or more, 0.2% or more, 0.3% or more, or 0.4% or more, particularly preferably 0.5% or more. Meanwhile, when the content of B₂O₃ is too large, the strain point is significantly reduced, or a β-OH value is significantly increased. While the details are described later, when the β-OH value is increased, thermal shrinkage in a temperature range equal to or lower than the strain point is increased. Accordingly, the content of B₂O₃ is preferably 9% or less, 7% or less, or 5% or less, particularly preferably 4% or less.

The molar ratio SiO₂/B₂O₃ is preferably 50 or less, 40 or less, 30 or less, or 25 or less, particularly preferably 20 or less. When the molar ratio SiO₂/B₂O₃ is too high, it becomes difficult to achieve both a high strain point and high meltability. The “SiO₂/B₂O₃” refers to a value obtained by dividing the content of SiO₂ by the content of B₂O₃.

MgO is a component which reduces the viscosity at high temperature to improve the meltability, and is also a component which improves devitrification resistance through balance with other components. Further, from the viewpoint of mechanical characteristics, MgO is a component which remarkably increases a Young's modulus. Accordingly, the content of MgO is preferably 1% or more, 3% or more, 5% or more, or 6% or more, particularly preferably 7% or more. Meanwhile, when the content of MgO is too large, the strain point is liable to be reduced, or the balance with other components is lost, resulting in a higher devitrification tendency. Accordingly, the content of MgO is preferably 15% or less, 13% or less, or 10% or less, particularly preferably 8% or less.

CaO is a component which reduces the viscosity at high temperature to improve the meltability, and is also a component which improves the devitrification resistance through balance with other components. Accordingly, the content of CaO is preferably 1% or more or 3% or more, particularly preferably 5% or more. Meanwhile, when the content of CaO is too large, the strain point is liable to be reduced. Accordingly, the content of CaO is preferably 15% or less, 13% or less, 10% or less, or 8% or less, particularly preferably 7% or less.

SrO is a component which reduces the viscosity at high temperature to improve the meltability, and is also a component which improves the devitrification resistance through balance with other components. Accordingly, the content of SrO is preferably 0% or more, 0.5% or more, or 1% or more, particularly preferably 1.5% or more. Meanwhile, when the content of SrO is too large, the strain point is liable to be reduced. Accordingly, the content of SrO is preferably 7% or less, 5% or less, or 3% or less, particularly preferably 2% or less.

BaO is a component which reduces the viscosity at high temperature to improve the meltability, and is also a component which improves the devitrification resistance through balance with other components. Accordingly, the content of BaO is preferably 0% or more, 0.5% or more, or 1% or more, particularly preferably 1.5% or more. Meanwhile, when the content of BaO is too large, the strain point is liable to be reduced. Accordingly, the content of BaO is preferably 8% or less, 6% or less, 4% or less, or 3% or less, particularly preferably 2% or less.

The total content of SrO and BaO is preferably 0% or more, 0.5% or more, 1% or more, 1.2% or more, or 1.4% or more, particularly preferably 1.6% or more. When the total content of SrO and BaO is too small, the meltability is liable to be reduced. Meanwhile, when the total content of SrO and BaO is too large, the glass composition loses its component balance, and the devitrification resistance is liable to be reduced. Accordingly, the total content of SrO and BaO is preferably 6% or less, 4% or less, 3% or less, 2.5% or less, or 2.2% or less, particularly preferably 2% or less.

The molar ratio B₂O₃/BaO is preferably 1 or more, 2 or more, 5 or more, or 8 or more, particularly preferably 10 or more. When the molar ratio B₂O₃/BaO is too low, the balance between the glass components is lost in a glass system according to the present invention, and the devitrification resistance is liable to be reduced. The “B₂O₃/BaO” refers to a value obtained by dividing the content of B₂O₃ by the content of BaO.

The molar ratio BaO/(SrO+BaO) is preferably 1 or less, 0.8 or less, 0.6 or less, or 0.4 or less, particularly preferably 0.2 or less. When the molar ratio BaO/(SrO+BaO) is too large, the balance between the glass components is lost in a glass system according to the present invention, and the devitrification resistance is liable to be reduced. The “BaO/(SrO+BaO)” refers to a value obtained by dividing the content of BaO by the total content of SrO and BaO.

The molar ratio (SiO₂+Al₂O₃+B₂O₃)/(SrO+BaO) is preferably 10 or more, 15 or more, 20 or more, or 25 or more, particularly preferably 30 or more. When the molar ratio (SiO₂+Al₂O₃+B₂O₃)/(SrO+BaO) is too low, it becomes difficult to achieve both a high strain point and a high Young's modulus. The “(SiO₂+Al₂O₃+B₂O₃)/(SrO+BaO)” refers to a value obtained by dividing the total content of SiO₂, Al₂O₃, and B₂O₃ by the total content of SrO and BaO.

When (CaO+SrO+BaO)—(Al₂O₃+B₂O₃) is too large, the amount of non-bridging oxygen in the glass is increased, and a thermal shrinkage rate is increased. Accordingly, (CaO+SrO+BaO)—(Al₂O₃+B₂O₃) is preferably 5% or less, 3% or less, 1% or less, 0% or less, −1% or less, or −3% or less, particularly preferably −4% or less. Meanwhile, when (CaO+SrO+BaO)—(Al₂O₃+B₂O₃) is too small, the strain point is reduced, and the thermal shrinkage rate is increased contrarily. Accordingly, (CaO+SrO+BaO)—(Al₂O₃+B₂O₃) is preferably −20% or more, −15% or more, −10% or more, or −7% or more, particularly preferably −6% or more. The “(CaO+SrO+BaO)—(Al₂O₃+B₂O₃)” refers to a value obtained by subtracting the total content of Al₂O₃ and B₂O₃ from the total content of CaO, SrO, and BaO.

Y₂O₃ is a component which increases the strain point and the Young's modulus. However, when the content thereof is too large, a density and raw material cost are liable to be increased. Accordingly, the content of Y₂O₃ is preferably from 0% to 0.8%, from 0% to 0.7%, from 0% to 0.5%, or from 0% to 0.2%, particularly preferably from 0% to less than 0.1%.

La₂O₃ is a component which increases the strain point and the Young's modulus. However, when the content thereof is too large, the density and the raw material cost are liable to be increased. Accordingly, the content of La₂O₃ is preferably from 0% to 0.8%, from 0% to 0.7%, from 0% to 0.5%, or from 0% to 0.2%, particularly preferably from 0% to less than 0.1%.

The total content of Y₂O₃ and La₂O₃ is preferably from 0% to less than 1.0%, from 0% to 0.8%, from 0% to 0.7%, from 0% to 0.5%, or from 0% to 0.2%, particularly preferably from 0% to less than 0.1%. However, when the total content of Y₂O₃ and La₂O₃ is too large, the density and the raw material cost are liable to be increased.

The alkali-free glass sheet of the present invention may comprise the following components in the glass composition in addition to the above-mentioned components.

ZnO is a component which increases the meltability. However, when ZnO is contained in a large amount, the glass is liable to devitrify, and in addition, the strain point is liable to be reduced. The content of ZnO is preferably from 0% to 5%, from 0% to 3%, from 0% to 0.5%, or from 0% to 0.3%, particularly preferably from 0% to 0.2%.

P₂O₅ is a component which remarkably reduces the liquidus temperature of an Al-based devitrified crystal while maintaining the strain point. However, when P₂O₅ is contained in a large amount, the Young's modulus is reduced, or the glass undergoes phase separation. In addition, there is a risk in that P may be diffused from the glass and affect the performance of a TFT. Accordingly, the content of P₂O₃ is preferably from 0% to 5%, from 0% to 3%, or from 0% to 1%, particularly preferably from 0% to 0.5%.

TiO₂ is a component which reduces the viscosity at high temperature and thus increases the meltability, and is also a component which suppresses solarization. However, when TiO₂ is contained in a large amount, the glass is colored, and thus a transmittance is liable to be reduced. Accordingly, the content of TiO₂ is preferably from 0% to 3%, from 0% to 1%, or from 0% to 0.1%, particularly preferably from 0% to 0.02%.

SnO₂ is a component which exhibits a satisfactory fining action in a high temperature region. In addition, SnO₂ is a component which increases the strain point, and is also a component which reduces the viscosity at high temperature. The content of SnO₂ is preferably from 0% to 1%, from 0.001% to 1%, or from 0.05% to 0.5%, particularly preferably from 0.08% to 0.2%. When the content of SnO₂ is too large, a devitrified crystal of SnO₂ is liable to precipitate. When the content of SnO₂ is less than 0.001%, it becomes difficult to exhibit the above-mentioned effects.

SnO₂ is suitable as a fining agent, but any other fining agent than SnO₂ may be used as long as the characteristics of the glass are not significantly impaired. Specifically, As₂O₃, Sb₂O₃, CeO₂, F₂, Cl₂, SO₃, and C may be added at a total content of, for example, up to 0.5%, and metal powders, such as Al and Si, may be added at a total content of, for example, up to 0.5%.

As₂O₃ and Sb₂O₃ are excellent in fining property, but from an environmental viewpoint, it is preferred to introduce As₂O₃ and Sb₂O₃ in as small amounts as possible. Further, when As₂O₃ is contained in a large amount in the glass, solarization resistance tends to be reduced, and hence the content thereof is preferably 0.5% or less, particularly preferably 0.1% or less. It is desired that the alkali-free glass sheet be substantially free of As₂O₃. Herein, the “substantially free of As₂O₃” refers to a case in which the content of As₂O₃ in the glass composition is less than 0.05%. In addition, the content of Sb₂O₃ is preferably 1% or less, particularly preferably 0.5% or less. It is desired that the alkali-free glass sheet be substantially free of Sb₂O₃. Herein, the “substantially free of Sb₂O₃” refers to a case in which the content of Sb₂O₃ in the glass composition is less than 0.05%.

Cl has an effect of promoting the melting of alkali-free glass. When Cl is added, a reduction in melting temperature can be achieved, and the action of the fining agent is promoted. As a result, while melting cost is reduced, the lifetime of a glass production kiln can be prolonged. However, when the content of Cl is too large, the strain point is liable to be reduced. Accordingly, the content of Cl is preferably 0.5% or less, particularly preferably 0.1% or less. An alkaline earth metal chloride, such as strontium chloride, aluminum chloride, or the like may be used as a raw material for introducing Cl.

The alkali-free glass sheet of the present invention preferably has the following characteristics.

The thermal expansion coefficient is preferably from 30×10⁻⁷/° C. to 45×10⁻⁷/° C., from 30×10⁻⁷/° C. to 42×10⁻⁷/° C., from 30×10⁻⁷/° C. to 40×10⁻⁷/° C., or from 30×10⁻⁷/° C. to 38×10⁻⁷/° C., particularly preferably from 30×10⁻⁷/° C. to 36×10⁻⁷/° C. When the thermal expansion coefficient is too high, the glass sheet is liable to have a local dimensional change owing to temperature variations in the film forming process at high temperature.

The density is preferably 2.80 g/cm³ or less, 2.75 g/cm³ or less, 2.70 g/cm³ or less, 2.65 g/cm³ or less, 2.60 g/cm³ or less, or 2.55 g/cm³ or less, particularly preferably from 2.45 g/cm³ to 2.50 g/cm³. When the density is too high, the deflection amount of the glass sheet is liable to be increased, and hence pattern deviation caused by stress is liable to be promoted in, for example, manufacturing steps for a display.

The strain point is preferably 650° C. or more, 680° C. or more, 700° C. or more, 710° C. or more, 720° C. or more, or 730° C. or more, particularly preferably 740° C. or more. When the strain point is too low, thermal shrinkage is liable to occur in the glass sheet in the film forming process at high temperature.

The annealing point is preferably 720° C. or more, 750° C. or more, or 780° C. or more, particularly preferably 800° C. or more. When the annealing point is too low, thermal shrinkage is liable to occur in the glass sheet in the film forming process at high temperature.

The softening point is preferably 940° C. or more, 960° C. or more, or 980° C. or more, particularly preferably 1,000° C. or more. When the softening point is too low, thermal shrinkage is liable to occur in the glass sheet in the film forming process at high temperature.

The temperature at a viscosity at high temperature of 10^(2.5) dPa·s is preferably 1,656° C. or less, 1,620° C. or less, 1,600° C. or less, 1,590° C. or less, or 1,580° C. or less, particularly preferably 1,570° C. or less. When the temperature at 10^(2.5) dPa·s is high, the meltability and the fining property are liable to be reduced, resulting in a rise in manufacturing cost of the glass sheet.

The Young's modulus is preferably 76 GPa or more, 78 GPa or more, 79 GPa or more, 80 GPa or more, 81 GPa or more, or 82 GPa or more, particularly preferably 83 GPa or more. When the Young's modulus is too low, the deflection amount of the glass sheet is liable to be increased, and hence pattern deviation caused by stress is liable to be promoted in, for example, manufacturing steps for a display.

The specific Young's modulus is preferably 29 GPa/g·cm⁻³ or more, 30 GPa/g·cm⁻³ or more, 31 GPa/g·cm⁻³ or more, or 32 GPa/g·cm⁻³ or more, particularly preferably 33 GPa/g·cm⁻³ or more. When the specific Young's modulus is too low, the deflection amount of the glass sheet is liable to be increased, and hence pattern deviation caused by stress is liable to be promoted in, for example, manufacturing steps for a display.

The liquidus temperature is preferably 1,450° C. or less, 1,300° C. or less, or 1,200° C. or less, particularly preferably 1,150° C. or less. With this configuration, a devitrified crystal is less liable to be generated at the time of forming. Further, the glass sheet is easily formed by an overflow down-draw method, and hence the surface quality of the glass sheet is easily improved. Besides, the manufacturing cost of the glass sheet can be reduced. The “liquidus temperature” is a temperature at which a crystal precipitates after glass powder that has passed through a standard 30-mesh sieve (500 μm) and remains on a 50-mesh sieve (300 μm) is placed in a platinum boat and kept for 24 hours in a gradient heating furnace.

The liquidus viscosity is preferably 10^(4.6) dPa·s or more, 10^(5.0) dPa·s or more, or 10^(5.2) dPa·s or more, particularly preferably 10^(5.5) dPa·s or more. With this configuration, devitrification is less liable to occur at the time of forming, and hence the glass sheet is easily formed by an overflow down-draw method. As a result, the surface quality of the glass sheet can be improved. Besides, the manufacturing cost of the glass sheet can be reduced. Herein, the “liquidus viscosity” refers to a glass viscosity at the liquidus temperature, and may be measured by a platinum sphere pull up method.

The β-OH value is an indicator of the amount of water in the glass. When the β-OH value is reduced, the strain point can be increased. In addition, even with the same glass composition, a glass sheet having a lower β-OH value has lower thermal shrinkage in a temperature range equal to or lower than the strain point. The β-OH value is preferably 0.30/mm or less, 0.25/mm or less, 0.20/mm or less, or 0.15/mm or less, particularly preferably 0.10/mm or less. When the β-OH value is too low, the meltability is liable to be reduced. Accordingly, the β-OH value is preferably 0.01/mm or more, particularly preferably 0.03/mm or more. Herein, the “β-OH value” refers to a value determined using the following mathematical formula by measuring the transmittances of the glass with an FT-IR.

β-OH value=(1/X)log(T ₁ /T ₂)

X: Thickness (mm)

T₁: Transmittance (%) at a reference wavelength of 3,846 cm⁻¹

T₂: Minimum transmittance (%) at a wavelength around a hydroxyl group absorption wavelength of 3,600 cm⁻¹

It is preferred that the alkali-free glass sheet of the present invention have overflow-joined surfaces in a middle portion thereof in a sheet thickness direction. That is, it is preferred that the alkali-free glass sheet of the present invention be formed by an overflow down-draw method. The overflow down-draw method refers to a method in which molten glass is caused to overflow from both sides of a wedge-shaped refractory, and the overflowing molten glasses are subjected to down-draw downward at the lower end of the wedge-shaped refractory while being joined, to thereby form the glass into a flat sheet shape. By the overflow down-draw method, surfaces which are to serve as the surfaces of the glass sheet are formed in a state of free surfaces without being brought into contact with the refractory. As a result, a glass sheet having good surface quality can be manufactured without polishing at low cost. Further, an increase in area and a reduction in thickness are easily achieved as well.

The forming may be performed by, for example, a slot-down method, a redraw method, a float method, or a roll-out method as well as the overflow down-draw method.

The sheet thickness of the alkali-free glass sheet of the present invention is not particularly limited, but is preferably 1.0 mm or less, 0.7 mm or less, or 0.5 mm or less, particularly preferably from 0.05 mm to 0.4 mm. As the sheet thickness becomes smaller, weight saving of a liquid crystal panel or an OLED panel is more easily achieved. The sheet thickness may be adjusted based on, for example, a flow rate and a forming speed (sheet-drawing speed) at the time of glass production.

A method of manufacturing the alkali-free glass sheet of the present invention on an industrial scale preferably comprises a melting step of loading a glass batch to a melting furnace and heating the glass batch through application of a current with a heating electrode to obtain molten glass, the glass batch having been blended so as to comprise the above-mentioned glass composition, and a forming step of forming the obtained molten glass into an alkali-free glass sheet by an overflow down-draw method.

In general, a manufacturing process for the glass sheet comprises a melting step, a fining step, a supplying step, a stirring step, and a forming step. The melting step is a step of melting a glass batch obtained by blending glass raw materials to provide molten glass. The fining step is a step of fining the molten glass obtained in the melting step by an action of a fining agent or the like. The supplying step is a step of transferring the molten glass from one step to another. The stirring step is a step of stirring the molten glass to homogenize the molten glass. The forming step is a step of forming the molten glass into a glass sheet. A step other than the above-mentioned steps, for example, a state adjusting step of adjusting the molten glass to be in a state suitable for forming may be introduced after the stirring step as required.

When the alkali-free glass sheet is manufactured on an industrial scale, the glass is generally melted by heating with a combustion flame of a burner. The burner is generally arranged at an upper portion of a melting kiln, and uses fossil fuel as its fuel, specifically, for example, liquid fuel, such as heavy oil, or gas fuel, such as LPG. The combustion flame may be obtained by mixing the fossil fuel and oxygen gas. However, such method is liable to entail an increase in β-OH value because a large amount of water is mixed in the molten glass during the melting. Accordingly, in manufacturing the alkali-free glass sheet, it is preferred to perform heating through application of a current with a heating electrode, and it is more preferred to melt the glass by heating through application of a current with a heating electrode without heating with the combustion flame of the burner, that is, perform full electric melting. With this configuration, water is less liable to be mixed in the molten glass during the melting, and hence the β-OH value is easily controlled to 0.30/mm or less, 0.25/mm or less, 0.20/mm or less, or 0.15/mm or less, particularly 0.10/mm or less. Further, when the heating through application of a current with a heating electrode is performed, the amount of energy required for obtaining the molten glass per unit mass is reduced, and the amount of a melt volatile is reduced. As a result, an environmental load can be reduced.

Further, with regard to the heating through application of a current, as the amount of water in the glass batch becomes smaller, the β-OH value in the glass sheet is reduced more easily. Moreover, a raw material for introducing B₂O₃ is liable to be a maximum water mixing source. Accordingly, from the viewpoint of manufacturing an alkali-free glass sheet having a low β-OH value, it is preferred to reduce the content of B₂O₃ to the extent possible. In addition, as the amount of water in the glass batch becomes smaller, the glass batch spreads in a melting kiln more uniformly, and hence a homogeneous glass sheet with high quality is easily manufactured.

The heating through application of a current with a heating electrode is preferably performed by applying an alternating voltage to a heating electrode arranged at a bottom portion or a side portion of a melting kiln so as to be brought into contact with the molten glass in the melting kiln. A material having heat resistance and corrosion resistance to the molten glass is preferably used as a material for the heating electrode, and for example, tin oxide, molybdenum, platinum, or rhodium may be used. In particular, molybdenum is preferred from the viewpoint of the degree of freedom of installation in a furnace.

Examples

The present invention is hereinafter described by way of Examples. However, Examples below are merely examples, and the present invention is by no means limited to Examples below.

Examples (Sample Nos. 1 to 391) of the present invention are shown in Tables 1 to 28.

TABLE 1 (mol %) No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 No. 7 No. 8 SiO₂ 62.3 62.8 63.3 63.8 64.3 64.8 65.3 65.8 Al₂O₃ 14.0 13.8 13.7 13.5 13.3 13.1 12.9 12.7 B₂O₃ 3.3 3.3 3.2 3.2 3.1 3.1 3.0 3.0 MgO 9.1 9.0 8.9 8.8 8.6 8.5 84 8.3 CaO 7.1 7.0 6.9 6.8 6.7 6.6 6.5 6.4 SrO 1.5 1.5 1.4 1.4 1.4 1.4 1.4 1.3 BaO 2.5 2.5 2.4 2.4 2.4 2.3 2.3 2.3 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 18.88 19.03 19.78 19.94 20.74 20.90 21.77 21.93 SrO + BaO 4.0 4.0 3.8 3.8 3.8 3.7 3.7 3.6 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 19.9 20.0 21.1 21.2 21.2 21.9 21.9 22.6 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.2 −6.1 −6.2 −6.1 −5.9 −5.9 −5.7 −5.7 Thermal expansion 43.0 42.6 42.1 41.7 41.5 41.1 40.8 40.3 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.64 2.63 2.63 2.62 2.62 2.61 2.61 2.60 Strain point (° C.) 699 699 702 702 704 704 705 706 Annealing point 763 763 766 766 767 768 769 770 (° C.) Softening point 965 966 970 971 973 975 978 980 (° C.) 10^(4.0) dPa · s (° C.) 1,218 1,225 1,232 1,238 1,246 1,252 1,259 1,265 10^(3.0) dPa · s (° C.) 1,400 1,405 1,411 1,416 1,422 1,427 1,433 1,439 10^(2.5) dPa · s (° C.) 1,455 1,463 1,472 1,480 1,490 1,499 1,508 1,517 Young's modulus 85.1 85.0 84.8 84.7 84.3 84.1 84.0 83.7 (GPa) Specific Young's 32.3 32.3 32.3 32.3 32.2 32.3 32.2 32.2 modulus (GPa/g · cm⁻³) (mol %) No. 9 No. 10 No. 11 No. 12 No. 13 No. 14 SiO₂ 66.3 66.8 67.8 68.3 68.8 69.3 Al₂O₃ 12.5 12.4 12.0 11.8 11.6 11.4 B₂O₃ 2.9 2.9 2.8 2.8 2.7 2.7 MgO 8.1 8.0 7.8 7.7 7.5 7.4 CaO 6.3 6.2 6.1 6.0 5.9 5.8 SrO 1.3 1.3 1.3 1.2 1.2 1.2 BaO 2.2 2.2 2.1 2.1 2.1 2.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.86 23.03 24.21 24.39 25.48 25.67 SrO + BaO 3.5 3.5 3.4 3.3 3.3 3.2 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.4 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 23.3 23.5 24.3 25.1 25.2 26.1 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.6 −5.6 −5.3 −5.3 −5.1 −5.1 Thermal expansion 40.0 39.4 38.7 38.2 38.0 37.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.59 2.59 2.58 2.57 2.57 2.56 Strain point (° C.) 708 709 711 711 713 714 Annealing point 772 773 775 775 777 778 (° C.) Softening point 982 985 990 992 994 996 (° C.) 10^(4.0) dPa · s (° C.) 1,273 1,280 1,293 1,300 1,307 1,313 10^(3.0) dPa · s (° C.) 1,447 1,452 1,464 1,471 1,479 1,485 10^(2.5) dPa · s (° C.) 1,529 1,536 1,552 1,561 1,572 1,581 Young's modulus 83.3 83.4 83.2 82.9 82.6 82.4 (GPa) Specific Young's 32.1 32.2 32.3 32.3 32.2 32.2 modulus (GPa/g · cm⁻³)

TABLE 2 (mol %) No. 15 No. 16 No. 17 No. 18 No. 19 No. 20 No. 21 SiO₂ 69.8 70.3 70.8 71.3 71.8 72.3 71.2 Al₂O₃ 11.2 11.0 10.9 10.7 10.5 10.3 7.2 B₂O₃ 2.6 2.6 2.6 2.5 2.5 2.4 3.0 MgO 7.3 7.2 7.1 6.9 6.8 6.7 8.4 CaO 5.7 5.6 5.5 5.4 5.3 5.2 6.5 SrO 1.2 1.2 1.1 1.1 1.1 1.1 1.4 BaO 2.0 2.0 1.9 1.9 1.9 1.8 2.3 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 26.85 27.04 27.23 28.52 28.72 30.13 23.73 SrO + BaO 3.2 3.2 3.0 3.0 3.0 2.9 3.7 B₂O₃/BaO 1.3 1.3 1.4 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 26.1 26.2 28.1 28.2 28.3 29.3 22.0 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −4.9 −4.8 −5.0 −4.8 −4.7 −4.6 0.0 Thermal expansion 37.3 37.0 36.3 36.2 35.9 35.6 40.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.56 2.55 2.54 2.54 2.53 2.53 2.56 Strain point (° C.) 715 715 717 719 719 721 703 Annealing point 779 780 782 784 784 786 763 (° C.) Softening point 999 1,000 1,004 1,007 1,009 1,011 976 (° C.) 10^(4.0) dPa · s (° C.) 1,320 1,326 1,333 1,340 1,346 1,352 1,302 10^(3.0) dPa · s (° C.) 1,493 1,499 1,507 1,516 1,523 1,531 1,473 10^(2.5) dPa · s (° C.) 1,590 1,597 1,606 1,617 1,624 1,634 1,578 Young's modulus 82.2 82.1 82.0 81.6 81.5 81.3 79.6 (GPa) Specific Young's 32.2 32.2 32.3 32.2 32.2 32.2 31.1 modulus (GPa/g · cm⁻³) (mol %) No. 22 No. 23 No. 24 No. 25 No. 26 No. 27 No. 28 SiO₂ 70.8 70.4 70.0 69.7 69.3 68.9 68.5 Al₂O₃ 7.7 8.2 8.7 9.2 9.7 10.2 10.7 B₂O₃ 3.0 3.0 3.0 3.0 2.9 2.9 2.9 MgO 8.3 8.3 8.2 8.2 8.1 8.1 8.0 CaO 6.5 6.4 6.4 6.4 6.3 6.3 6.3 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO 2.3 2.3 2.2 2.2 2.2 2.2 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.60 23.47 23.33 23.23 23.90 23.76 23.62 SrO + BaO 3.6 3.6 3.5 3.5 3.5 3.5 3.5 B₂O₃/BaO 1.3 1.3 1.4 1.4 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 22.6 22.7 23.3 23.4 23.4 23.4 23.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −0.6 −1.2 −1.8 −2.3 −2.8 −3.3 −3.8 Thermal expansion 40.7 40.4 40.2 39.8 39.8 39.6 39.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.56 2.56 2.56 2.56 2.57 2.57 2.57 Strain point (° C.) 700 698 696 696 697 698 700 Annealing point 761 760 759 759 761 762 764 (° C.) Softening point 976 976 976 976 978 979 981 (° C.) 10^(4.0) dPa · s (° C.) 1,301 1,300 1,298 1,297 1,297 1,294 1,293 10^(3.0) dPa · s (° C.) 1,474 1,473 1,473 1,472 1,472 1,469 1,467 10^(2.5) dPa · s (° C.) 1,578 1,576 1,574 1,570 1,569 1,564 1,559 Young's modulus 79.8 80.2 80.5 81.1 81.3 81.8 82.1 (GPa) Specific Young's 31.2 31.3 31.4 31.7 31.7 31.8 31.9 modulus (GPa/g · cm⁻³)

TABLE 3 (mol %) No. 29 No. 30 No. 31 No. 32 No. 33 No. 34 No. 35 SiO₂ 68.1 67.7 67.0 66.6 66.2 65.8 65.4 Al₂O₃ 11.2 11.7 12.7 13.2 13.7 14.2 14.7 B₂O₃ 2.9 2.9 2.8 2.8 2.8 2.8 2.8 MgO 8.0 7.9 7.9 7.8 7.8 7.7 7.7 CaO 6.2 6.2 6.1 6.1 6.0 6.0 6.0 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.2 BaO 2.2 2.2 2.2 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.48 23.34 23.93 23.79 23.64 23.50 23.36 SrO + BaO 3.5 3.5 3.5 3.4 3.4 3.4 3.3 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/ 23.5 23.5 23.6 24.3 24.3 24.4 25.1 (SrO + BaO) (CaO + SrO + BaO) − −4.4 −4.9 −5.9 −6.5 −7.1 −7.6 −8.2 (Al₂O₃ + B₂O₃) Thermal expansion 39.3 39.2 38.9 38.7 38.5 38.4 38.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.58 2.58 2.58 2.59 2.59 2.59 2.59 Strain point (° C.) 702 706 715 719 724 728 732 Annealing point 767 770 777 781 784 787 789 (° C.) Softening point 983 985 991 993 995 997 999 (° C.) 10^(4.0) dPa · s (° C.) 1,291 1,289 1,286 1,284 1,283 1,281 1,280 10^(3.0) dPa · s (° C.) 1,464 1,461 1,455 1,451 1,446 1,441 1,436 10^(2.5) dPa · s (° C.) 1,554 1,549 1,538 1,533 1,527 1,522 1,516 Young's modulus 82.5 82.9 83.9 84.1 84.5 84.8 85.3 (GPa) Specific Young's 32.0 32.1 32.4 32.5 32.7 32.7 32.9 modulus (GPa/g · cm⁻³) (mol %) No. 36 No. 37 No. 38 No. 39 No. 40 No. 41 No. 42 SiO₂ 65.0 64.7 64.3 63.9 63.5 69.1 68.7 Al₂O₃ 15.2 15.7 16.2 16.7 17.2 12.5 12.4 B₂O₃ 2.8 2.7 2.7 2.7 2.7 0.4 0.9 MgO 7.6 7.6 7.5 7.5 7.4 8.1 8.1 CaO 5.9 5.9 5.9 5.8 5.8 6.3 6.3 SrO 1.2 1.2 1.2 1.2 1.2 1.3 1.3 BaO 2.1 2.1 2.1 2.1 2.0 2.2 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.21 23.96 23.81 23.67 23.52 172.75 76.33 SrO + BaO 3.3 3.3 3.3 3.3 3.2 3.5 3.5 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.4 0.2 0.4 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/ 25.2 25.2 25.2 25.2 26.1 23.4 23.4 (SrO + BaO) (CaO + SrO + BaO) − −8.8 −9.2 −9.7 −10.3 −10.9 −3.1 −3.5 (Al₂O₃ + B₂O₃) Thermal expansion 38.1 38.0 37.9 37.7 37.5 39.1 39.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.60 2.60 2.60 2.60 2.60 2.61 2.60 Strain point (° C.) 735 739 741 743 745 744 736 Annealing point 791 793 793 793 793 803 796 (° C.) Softening point 1,001 1,003 1,004 1,005 1,006 1,023 1,014 (° C.) 10^(4.0) dPa · s (° C.) 1,280 1,280 1,280 1,280 1,280 1,322 1,314 10^(3.0) dPa · s (° C.) 1,431 1,427 1,423 1,418 1,415 1,485 1,478 10^(2.5) dPa · s (° C.) 1,514 1,510 1,506 1,503 1,502 1,578 1,270 Young's modulus 85.5 86.1 86.4 86.8 87.0 86.1 85.5 (GPa) Specific Young's 32.9 33.1 33.2 33.3 33.4 33.0 32.9 modulus (GPa/g · cm⁻³)

TABLE 4 (mol %) No. 43 No. 44 No. 45 No. 46 No. 47 No. 48 No. 49 SiO₂ 68.4 68.0 67.7 67.0 66.7 66.3 66.0 Al₂O₃ 12.4 12.3 12.2 12.1 12.0 12.0 11.9 B₂O₃ 1.4 1.9 2.4 3.4 3.9 4.4 4.9 MgO 8.0 8.0 7.9 7.9 7.8 7.8 7.7 CaO 6.2 6.2 6.2 6.1 6.1 6.1 6.0 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO 2.2 2.2 2.2 2.2 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 48.86 35.79 28.21 19.71 17.10 15.07 13.47 SrO + BaO 3.5 3.5 3.5 3.5 3.4 3.4 3.4 B₂O₃/BaO 0.6 0.9 1.1 1.5 1.9 2.1 2.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 23.5 23.5 23.5 23.6 24.3 24.3 24.4 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −4.1 −4.5 −4.9 −5.9 −6.4 −6.9 −7.4 Thermal expansion 39.0 39.1 39.1 39.0 38.9 38.8 38.8 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.60 2.59 2.59 2.58 2.57 2.56 2.56 Strain point (° C.) 730 723 716 703 696 690 684 Annealing point 791 785 778 767 762 757 751 (° C.) Softening point 1,008 999 993 981 976 971 966 (° C.) 10^(4.0) dPa · s (° C.) 1,309 1,300 1,294 1,280 1,274 1,266 1,261 10^(3.0) dPa · s (° C.) 1,475 1,468 1,464 1,452 1,447 1,440 1,436 10^(2.5) dPa · s (° C.) 1,564 1,556 1,551 1,537 1,534 1,527 1,525 Young's modulus 84.9 84.4 83.7 82.8 82.1 81.7 81.0 (GPa) Specific Young's 32.7 32.6 32.4 32.1 32.0 31.9 31.7 modulus (GPa/g · cm⁻³) (mol %) No. 50 No. 51 No. 52 No. 53 No. 54 No. 55 No. 56 SiO₂ 65.6 65.3 64.9 64.6 64.2 63.9 71.0 Al₂O₃ 11.9 11.8 11.7 11.7 11.6 11.5 12.8 B₂O₃ 5.4 5.9 6.4 6.9 7.4 7.9 3.0 MgO 7.7 7.7 7.6 7.6 7.5 7.5 2.9 CaO 6.0 6.0 5.9 5.9 5.9 5.8 6.5 SrO 1.2 1.2 1.2 1.2 1.2 1.2 1.4 BaO 2.1 2.1 2.1 2.1 2.1 2.1 2.3 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 12.15 11.07 10.14 9.36 8.68 8.09 23.67 SrO + BaO 3.3 3.3 3.3 3.3 3.3 3.3 3.7 B₂O₃/BaO 2.6 2.8 3.0 3.3 3.5 3.8 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 25.1 25.2 25.2 25.2 25.2 25.2 23.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −8.0 −8.4 −8.9 −9.4 −9.8 −10.3 −5.6 Thermal expansion 38.7 38.6 38.7 38.5 38.7 38.6 35.7 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.55 2.54 2.54 2.53 2.53 2.54 Strain point (° C.) 679 672 666 661 655 650 735 Annealing point 747 741 736 732 726 721 796 (° C.) Softening point 962 958 955 952 950 948 1,037 (° C.) 10^(4.0) dPa · s (° C.) 1,254 1,248 1,243 1,238 1,232 1,228 1,368 10^(3.0) dPa · s (° C.) 1,428 1,422 1,417 1,410 1,404 1,399 1,534 10^(2.5) dPa · s (° C.) 1,520 1,517 1,516 1,512 1,511 1,511 1,641 Young's modulus 80.5 80.0 79.2 78.9 78.2 77.6 80.3 (GPa) Specific Young's 31.5 31.4 31.1 31.1 30.9 30.7 31.6 modulus (GPa/g · cm⁻³)

TABLE 5 (mol %) No. 57 No. 58 No. 59 No. 60 No. 61 No. 62 No. 63 SiO₂ 70.6 70.3 69.9 69.5 69.2 68.8 68.4 Al₂O₃ 12.8 12.7 12.6 12.6 12.5 12.4 12.4 B₂O₃ 3.0 3.0 3.0 3.0 2.9 2.9 2.9 MgO 3.4 3.9 4.4 4.9 5.4 5.9 6.4 CaO 6.5 6.4 6.4 6.4 6.3 6.3 6.3 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO 2.3 2.3 2.2 2.2 2.2 2.2 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.53 23.43 23.30 23.17 23.86 23.72 23.59 SrO + BaO 3.6 3.6 3.5 3.5 3.5 3.5 3.5 B₂O₃/BaO 1.3 1.3 1.4 1.4 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.0 23.9 24.4 24.3 24.2 24.0 23.9 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.7 −5.7 −5.7 −5.7 −5.6 −5.5 −5.5 Thermal expansion 35.9 36.2 36.5 36.8 37.2 37.7 38.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.55 2.55 2.56 2.56 2.57 2.57 Strain point (° C.) 733 731 728 726 724 721 718 Annealing point 794 791 788 785 784 781 779 (° C.) Softening point 1,032 1,027 1,021 1,016 1,012 1,006 1,001 (° C.) 10^(4.0) dPa · s (° C.) 1,360 1,353 1,344 1,336 1,329 1,320 1,311 10^(3.0) dPa · s (° C.) 1,525 1,517 1,509 1,500 1,494 1,487 1,478 10^(2.5) dPa · s (° C.) 1,631 1,622 1,613 1,601 1,594 1,583 1,572 Young's modulus 80.6 80.9 81.0 81.5 81.7 82.0 82.4 (GPa) Specific Young's 31.7 31.7 31.8 31.9 31.9 31.9 32.1 modulus (GPa/g · cm⁻³) (mol %) No. 64 No. 65 No. 66 No. 67 No. 68 No. 69 No. 70 SiO₂ 68.1 67.7 67.0 66.6 66.2 65.9 65.5 Al₂O₃ 12.3 12.2 12.1 12.0 12.0 11.9 11.8 B₂O₃ 2.9 2.9 2.8 2.8 2.8 2.8 2.8 MgO 6.9 7.4 8.4 8.9 9.4 9.9 10.4 CaO 6.2 6.2 6.1 6.1 6.1 6.0 6.0 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.2 BaO 2.2 2.2 2.2 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.48 23.34 23.93 23.79 23.64 23.54 23.39 SrO + BaO 3.5 3.5 3.5 3.4 3.4 3.4 3.3 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 23.8 23.7 23.4 23.9 23.8 23.7 24.3 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.5 −5.4 −5.3 −5.3 −5.3 −5.3 −5.3 Thermal expansion 38.3 38.7 39.5 39.9 40.2 40.5 40.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.58 2.59 2.59 2.59 2.60 2.60 Strain point (° C.) 715 712 707 704 702 700 698 Annealing point 777 775 772 770 768 766 764 (° C.) Softening point 997 991 983 979 975 972 969 (° C.) 10^(4.0) dPa · s (° C.) 1,304 1,295 1,279 1,270 1,261 1,254 1,245 10^(3.0) dPa · s (° C.) 1,472 1,465 1,452 1,445 1,437 1,431 1,424 10^(2.5) dPa · s (° C.) 1,564 1,553 1,535 1,526 1,515 1,508 1,499 Young's modulus 82.7 82.9 83.6 83.8 84.2 84.5 84.6 (GPa) Specific Young's 32.1 32.2 32.3 32.4 32.5 32.5 32.6 modulus (GPa/g · cm⁻³)

TABLE 6 (mol %) No. 71 No. 72 No. 73 No. 74 No. 75 No. 76 No. 77 SiO₂ 65.2 64.8 64.4 64.1 63.7 70.9 70.6 Al₂O₃ 11.8 11.7 11.6 11.6 11.5 12.8 12.8 B₂O₃ 2.8 2.7 2.7 2.7 2.7 3.0 3.0 MgO 10.9 11.4 11.9 12.4 12.9 8.3 8.3 CaO 6.0 5.9 5.9 5.9 5.8 1.2 1.7 SrO 1.2 1.2 1.2 1.2 1.2 1.3 1.3 BaO 2.1 2.1 2.1 2.1 2.0 2.3 2.3 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.29 24.00 23.85 23.74 23.59 23.63 23.53 SrO + BaO 3.3 3.3 3.3 3.3 3.2 3.6 3.6 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.4 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.2 24.0 23.8 23.8 24.3 24.1 24.0 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.3 −5.2 −5.1 −5.1 −5.2 −11.0 −10.5 Thermal expansion 41.0 41.6 42.1 42.2 42.6 32.0 32.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.60 2.61 2.61 2.62 2.62 2.53 2.53 Strain point (° C.) 697 697 696 696 696 742 740 Annealing point 762 761 759 757 756 803 800 (° C.) Softening point 966 964 962 960 958 1,021 1,018 (° C.) 10^(4.0) dPa · s (° C.) 1,238 1,230 1,221 1,214 1,205 1,358 1,352 10^(3.0) dPa · s (° C.) 1,418 1,412 1,405 1,399 1,393 1,521 1,512 10^(2.5) dPa · s (° C.) 1,489 1,482 1,474 1,464 1,457 1,628 1,619 Young's modulus 85.2 85.3 85.6 86.1 86.2 82.7 83.0 (GPa) Specific Young's 32.8 32.7 32.7 32.9 32.9 32.6 32.7 modulus (GPa/g · cm⁻³) (mol %) No. 78 No. 79 No. 80 No. 81 No. 82 No. 83 No. 84 SiO₂ 70.2 69.9 69.5 69.1 68.8 68.4 68.1 Al₂O₃ 12.7 12.6 12.6 12.5 12.4 12.4 12.3 B₂O₃ 3.0 3.0 3.0 2.9 2.9 2.9 2.9 MgO 8.2 8.2 8.2 8.1 8.1 8.0 8.0 CaO 2.2 2.7 3.2 3.7 4.2 4.7 5.2 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO 2.3 2.2 2.2 2.2 2.2 2.2 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.40 23.30 23.17 23.83 23.72 23.59 23.48 SrO + BaO 3.6 3.5 3.5 3.5 3.5 3.5 3.5 B₂O₃/BaO 1.3 1.4 1.4 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 23.9 24.4 24.3 24.1 24.0 23.9 23.8 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −9.9 −9.4 −8.9 −8.2 −7.6 −7.1 −6.5 Thermal expansion 33.2 33.8 34.4 35.4 36.0 36.8 37.4 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.54 2.54 2.55 2.56 2.56 2.57 2.57 Strain point (° C.) 736 733 730 728 724 721 717 Annealing point 798 795 793 790 787 784 780 (° C.) Softening point 1,015 1,011 1,008 1,005 1,001 998 994 (° C.) 10^(4.0) dPa · s (° C.) 1,344 1,337 1,330 1,322 1,315 1,308 1,301 10^(3.0) dPa · s (° C.) 1,504 1,497 1,489 1,484 1,479 1,473 1,468 10^(2.5) dPa · s (° C.) 1,611 1,603 1,592 1,585 1,576 1,568 1,559 Young's modulus 82.8 82.9 83.1 83.0 83.1 83.2 83.3 (GPa) Specific Young's 32.6 32.6 32.6 32.5 32.5 32.4 32.4 modulus (GPa/g · cm⁻³)

TABLE 7 (mol %) No. 85 No. 86 No. 87 No. 88 No. 89 No. 90 No. 91 SiO₂ 67.7 67.0 66.6 66.3 65.9 65.6 65.2 Al₂O₃ 12.2 12.1 12.0 12.0 11.9 11.8 11.8 B₂O₃ 2.9 2.8 2.8 2.8 2.8 2.8 2.8 MgO 7.9 7.9 7.8 7.8 7.7 7.7 7.6 CaO 5.7 6.7 7.2 7.7 8.2 8.7 9.2 SrO 1.3 1.3 1.3 1.3 1.3 1.2 1.2 BaO 2.2 2.2 2.1 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.34 23.93 23.79 23.68 23.54 23.43 23.29 SrO + BaO 3.5 3.5 3.4 3.4 3.4 3.3 3.3 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 23.7 23.4 23.9 23.9 23.7 24.3 24.2 (CaO + SrO + BaO) − −5.9 −4.7 −4.2 −3.7 −3.1 −2.6 −2.1 (Al₂O₃ + B₂O₃) Thermal expansion 38.3 39.9 40.7 41.3 42.2 42.9 43.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.58 2.59 2.59 2.59 2.60 2.60 2.61 Strain point (° C.) 713 706 702 699 695 691 688 Annealing point 776 770 766 762 758 754 750 (° C.) Softening point 990 984 981 979 976 974 973 (° C.) 10^(4.0) dPa · s (° C.) 1,294 1,280 1,272 1,266 1,259 1,253 1,247 10^(3.0) dPa · s (° C.) 1,464 1,452 1,447 1,440 1,434 1,428 1,421 10^(2.5) dPa · s (° C.) 1,552 1,536 1,530 1,522 1,516 1,511 1,505 Young's modulus 83.2 83.5 83.3 83.6 83.5 83.5 83.6 (GPa) Specific Young's 32.3 32.3 32.1 32.2 32.1 32.1 32.0 modulus (GPa/g · cm⁻³) (mol %) No. 92 No. 93 No. 94 No. 95 No. 96 No. 97 No. 98 SiO₂ 64.8 64.5 64.1 63.8 68.0 67.7 67.0 Al₂O₃ 11.7 11.6 11.6 11.5 12.3 12.2 12.1 B₂O₃ 2.8 2.7 2.7 2.7 2.9 2.9 2.8 MgO 7.6 7.6 7.5 7.5 8.0 7.9 7.9 CaO 9.7 10.2 10.7 11.2 6.2 6.2 6.1 SrO 1.2 1.2 1.2 1.2 0.3 0.8 1.8 BaO 2.1 2.1 2.1 2.0 2.2 2.2 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.14 23.89 23.74 23.63 23.45 23.34 23.93 SrO + BaO 3.3 3.3 3.3 3.2 2.5 3.0 4.0 B₂O₃/BaO 1.3 1.3 1.3 1.4 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.9 0.7 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.0 23.9 23.8 24.4 33.3 27.6 20.5 (CaO + SrO + BaO) − −1.5 −0.8 −0.3 0.2 −6.5 −5.9 −4.8 (Al₂O₃ + B₂O₃) Thermal expansion 44.4 45.2 46.0 46.5 37.2 38.2 40.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.62 2.62 2.63 2.63 2.56 2.57 2.59 Strain point (° C.) 683 681 678 674 716 712 707 Annealing point 746 742 739 735 780 776 770 (° C.) Softening point 971 970 969 969 996 991 983 (° C.) 10^(4.0) dPa · s (° C.) 1,240 1,235 1,229 1,224 1,296 1,292 1,282 10^(3.0) dPa · s (° C.) 1,414 1,407 1,400 1,394 1,464 1,462 1,455 10^(2.5) dPa · s (° C.) 1,499 1,495 1,490 1,486 1,554 1,549 1,539 Young's modulus 83.6 83.7 83.8 83.8 83.5 83.3 83.2 (GPa) Specific Young's 32.0 31.9 31.9 31.9 32.6 32.4 32.1 modulus (GPa/g · cm⁻³)

TABLE 8 (mol %) No. 99 No. 100 No. 101 No. 102 No. 103 No. 104 No. 105 SiO₂ 66.7 66.3 66.0 65.6 65.3 65.0 64.6 Al₂O₃ 12.0 12.0 11.9 11.9 11.8 11.7 11.7 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.8 2.7 MgO 7.8 7.8 7.7 7.7 7.7 7.6 7.6 CaO 6.1 6.1 6.0 6.0 6.0 5.9 5.9 SrO 2.3 2.8 3.3 3.8 4.3 4.8 5.3 BaO 2.1 2.1 2.1 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.82 23.68 23.57 23.43 23.32 23.21 23.93 SrO + BaO 4.4 4.9 5.4 5.9 6.4 6.9 7.4 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.5 0.4 0.4 0.4 0.3 0.3 0.3 (SiO₂ + Al₂O₃ + B₂O₃)/ 18.5 16.6 14.9 13.6 12.5 11.5 10.7 (SrO + BaO) (CaO + SrO + BaO) − −4.3 −3.8 −3.3 −2.8 −2.2 −1.7 −1.1 (Al₂O₃ + B₂O₃) Thermal expansion 40.9 41.8 42.7 43.6 44.5 45.4 46.3 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.60 2.62 2.63 2.64 2.65 2.66 2.67 Strain point (° C.) 705 702 701 699 697 697 698 Annealing point 767 763 760 757 753 751 749 (° C.) Softening point 980 977 974 972 970 969 968 (° C.) 10^(4.0) dPa · s (° C.) 1,278 1,273 1,269 1,264 1,260 1,257 1,252 10^(3.0) dPa · s (° C.) 1,451 1,446 1,442 1,436 1,431 1,427 1,420 10^(2.5) dPa · s (° C.) 1,536 1,530 1,528 1,522 1,519 1,518 1,514 Young's modulus 82.9 83.0 82.6 82.7 82.7 82.3 82.4 (GPa) Specific Young's 31.9 31.7 31.5 31.3 31.2 30.9 30.8 modulus (GPa/g · cm⁻³) (mol %) No. 106 No. 107 No. 108 No. 109 No. 110 No. 111 No. 112 SiO₂ 64.3 63.9 68.7 68.4 68.0 67.7 67.0 Al₂O₃ 11.6 11.5 12.4 12.4 12.3 12.2 12.1 B₂O₃ 2.7 2.7 2.9 2.9 2.9 2.9 2.8 MgO 7.5 7.5 8.1 8.0 8.0 7.9 7.9 CaO 5.9 5.8 6.3 6.2 6.2 6.2 6.1 SrO 5.8 6.3 1.3 1.3 1.3 1.3 1.3 BaO 2.1 2.1 0.2 0.7 1.2 1.7 2.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.81 23.67 23.69 23.59 23.45 23.34 23.93 SrO + BaO 7.9 8.4 1.5 2.0 2.5 3.0 4.0 B₂O₃/BaO 1.3 1.3 14.5 4.1 2.4 1.7 1.0 BaO/(SrO + BaO) 0.3 0.3 0.1 0.4 0.5 0.6 0.7 (SiO₂ + Al₂O₃ + B₂O₃)/ 9.9 9.3 56.0 41.9 33.3 27.6 20.5 (SrO + BaO) (CaO + SrO + BaO) − −0.5 0.0 −7.5 −7.1 −6.5 −5.9 −4.8 (Al₂O₃ + B₂O₃) Thermal expansion 47.2 48.1 35.1 35.9 37.0 38.1 40.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.69 2.70 2.51 2.53 2.54 2.56 2.60 Strain point (° C.) 697 698 721 719 715 712 708 Annealing point 747 745 788 785 781 777 770 (° C.) Softening point 968 967 1,002 1,000 995 991 984 (° C.) 10^(4.0) dPa · s (° C.) 1,249 1,244 1,300 1,298 1,293 1,290 1,284 10^(3.0) dPa · s (° C.) 1,415 1,409 1,464 1,464 1,462 1,461 1,456 10^(2.5) dPa · s (° C.) 1,512 1,510 1,558 1,555 1,550 1,548 1,541 Young's modulus 82.2 81.9 84.4 84.1 83.8 83.5 83.1 (GPa) Specific Young's 30.6 30.3 33.7 33.3 32.9 32.6 31.9 modulus (GPa/g · cm⁻³)

TABLE 9 (mol %) No. 113 No. 114 No. 115 No. 116 No. 117 No. 118 No. 119 SiO₂ 66.7 66.3 66.0 65.6 65.3 64.9 64.6 Al₂O₃ 12.0 12.0 11.9 11.9 11.8 11.7 11.7 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.8 2.7 MgO 7.8 7.8 7.7 7.7 7.7 7.6 7.6 CaO 6.1 6.1 6.0 6.0 6.0 5.9 5.9 SrO 1.3 1.3 1.3 1.2 1.2 1.2 1.2 BaO 3.2 3.7 4.2 4.7 5.2 5.7 6.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.82 23.68 23.57 23.43 23.32 23.18 23.93 SrO + BaO 4.5 5.0 55 5.9 6.4 6.9 7.4 B₂O₃/BaO 0.9 0.8 0.7 0.6 0.5 0.5 0.4 BaO/(SrO + BaO) 0.7 0.7 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 18.1 16.2 14.7 13.6 12.5 11.5 10.7 (SrO + BaO) (CaO + SrO + BaO) − −4.2 −3.7 −3.2 −2.8 −2.2 −1.7 −1.1 (Al₂O₃ + B₂O₃) Thermal expansion 41.2 42.2 43.3 44.2 45.1 46.3 47.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.62 2.64 2.66 2.68 2.69 2.71 2.73 Strain point (° C.) 705 703 702 701 700 701 702 Annealing point 766 763 760 757 754 753 752 (° C.) Softening point 980 977 975 973 972 971 971 (° C.) 10^(4.0) dPa · s (° C.) 1,281 1,277 1,275 1,271 1,268 1,265 1,263 10^(3.0) dPa · s (° C.) 1,453 1,448 1,446 1,441 1,436 1,431 1,427 10^(2.5) dPa · s (° C.) 1,539 1,534 1,534 1,530 1,528 1,527 1,525 Young's modulus 82.7 82.6 82.1 81.9 81.7 81.2 81.2 (GPa) Specific Young's 31.6 31.3 30.9 30.6 30.4 29.9 29.7 modulus (GPa/g · cm⁻³) (mol %) No. 120 No. 121 No. 122 No. 123 No. 124 No. 125 No. 126 SiO₂ 64.2 63.9 67.2 67.1 66.9 66.8 66.7 Al₂O₃ 11.6 11.5 12.1 12.1 12.1 12.1 12.0 B₂O₃ 2.7 2.7 2.9 2.8 2.8 2.8 2.8 MgO 7.5 7.5 7.9 7.9 7.9 7.8 7.8 CaO 5.9 5.8 6.1 6.1 6.1 6.1 6.1 SrO 1.2 1.2 1.3 1.3 1.3 1.3 1.3 BaO 6.7 7.2 2.2 2.2 2.2 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.2 0.4 0.6 0.8 1.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.78 23.67 23.17 23.96 23.89 23.86 23.82 SrO + BaO 7.9 8.4 3.5 3.5 3.5 3.4 3.4 B₂O₃/BaO 0.4 0.4 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.8 0.9 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + B₂O₃)/ 9.9 9.3 23.5 23.4 23.4 24.0 24.0 (SrO + BaO) (CaO + SrO + BaO) − −0.5 0.0 −5.4 −5.3 −5.3 −5.4 −5.3 (Al₂O₃ + B₂O₃) Thermal expansion 48.3 49.1 39.0 39.0 39.0 38.9 38.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.75 2.77 2.58 2.58 2.58 2.57 2.57 Strain point (° C.) 703 704 708 709 708 708 707 Annealing point 750 750 771 771 769 769 767 (° C.) Softening point 971 971 985 985 983 983 981 (° C.) 10^(4.0) dPa · s (° C.) 1,260 1,258 1,287 1,289 1,289 1,290 1,291 10^(3.0) dPa · s (° C.) 1,421 1,416 1,459 1,461 1,461 1,463 1,463 10^(2.5) dPa · s (° C.) 1,524 1,523 1,545 1,548 1,548 1,551 1,553 Young's modulus 80.7 80.4 82.9 82.7 82.4 82.0 81.7 (GPa) Specific Young's 29.3 29.0 32.1 32.1 32.0 31.9 31.8 modulus (GPa/g · cm⁻³)

TABLE 10 (mol %) No. 127 No. 128 No. 129 No. 130 No. 131 No. 132 No. 133 SiO₂ 66.5 66.4 66.3 66.1 66.0 65.9 65.7 Al₂O₃ 12.0 12.0 12.0 11.9 11.9 11.9 11.9 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.8 2.8 MgO 7.8 7.8 7.8 7.8 7.7 7.7 7.7 CaO 6.1 6.1 6.1 6.0 6.0 6.0 6.0 SrO 1.3 1.3 1.3 1.3 1.3 1.3 1.2 BaO 2.1 2.1 2.1 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 1.2 1.4 1.6 1.8 2.0 2.2 2.4 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.75 23.71 23.68 23.61 23.57 23.54 23.46 SrO + BaO 3.4 3.4 3.4 3.4 3.4 3.4 3.3 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + 23.9 23.9 23.9 23.8 23.7 23.7 24.4 B₂O₃)/(SrO + BaO) (CaO + SrO + BaO) − −5.3 −5.3 −5.3 −5.3 −5.3 −5.3 −5.4 (Al₂O₃ + B₂O₃) Thermal expansion 38.9 38.7 38.6 38.8 38.7 38.5 38.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.56 2.56 2.56 2.55 2.55 2.55 Strain point (° C.) 706 706 705 704 704 704 703 Annealing point 765 764 762 761 759 758 757 (° C.) Softening point 979 978 977 975 974 974 972 (° C.) 10^(4.0) dPa · s (° C.) 1,291 1,292 1,293 1,293 1,294 1,296 1,295 10^(3.0) dPa · s (° C.) 1,463 1,464 1,465 1,465 1,467 1,467 1,467 10^(2.5) dPa · s (° C.) 1,553 1,554 1,554 1,557 1,559 1,560 1,561 Young's modulus 81.4 81.2 81.1 80.5 80.1 80.0 79.6 (GPa) Specific Young's 31.7 31.7 31.7 31.5 31.4 31.3 31.2 modulus (GPa/g · cm⁻³) (mol %) No. 134 No. 135 No. 136 No. 137 No. 138 No. 139 No. 140 SiO₂ 65.6 65.5 65.3 65.2 65.1 64.9 64.8 Al₂O₃ 11.8 11.8 11.8 11.8 11.8 11.7 11.7 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.8 2.7 MgO 7.7 7.7 7.7 7.6 7.6 7.6 7.6 CaO 6.0 6.0 6.0 6.0 5.9 5.9 5.9 SrO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 BaO 2.1 2.1 2.1 2.1 2.1 2.1 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 2.6 2.8 3.0 3.2 3.4 3.6 3.8 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.43 23.39 23.32 23.29 23.25 23.18 24.00 SrO + BaO 3.3 3.3 3.3 3.3 3.3 3.3 3.3 B₂O₃/BaO 1.3 1.3 1.3 1.3 1.3 1.3 1.3 BaO/(SrO + BaO) 0.6 0.6 0.6 0.6 0.6 0.6 0.6 (SiO₂ + Al₂O₃ + 24.3 24.3 24.2 24.2 24.2 24.1 24.0 B₂O₃)/(SrO + BaO) (CaO + SrO + BaO) − −5.3 −5.3 −5.3 −5.3 −5.4 −5.3 −5.2 (Al₂O₃ + B₂O₃) Thermal expansion 38.5 38.3 38.4 38.3 38.1 38.3 38.3 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.54 2.54 2.54 2.53 2.53 2.53 Strain point (° C.) 702 702 701 701 701 699 700 Annealing point 755 754 752 751 750 748 748 (° C.) Softening point 971 970 969 969 968 966 967 (° C.) 10^(4.0) dPa · s (° C.) 1,296 1,297 1,297 1,299 1,300 1,299 1,301 10^(3.0) dPa · s (° C.) 1,468 1,468 1,467 1,469 1,470 1,469 1,470 10^(2.5) dPa · s (° C.) 1,562 1,563 1,563 1,565 1,567 1,567 1,569 Young's modulus 79.2 79.1 78.8 78.4 78.1 77.7 77.5 (GPa) Specific Young's 31.1 31.1 31.0 30.9 30.9 30.7 30.6 modulus (GPa/g · cm⁻³)

TABLE 11 (mol %) No. 141 No. 142 No. 143 No. 144 No. 145 No. 146 No. 147 SiO₂ 64.7 60.9 61.4 61.9 62.4 62.9 63.4 Al₂O₃ 11.7 15.3 15.1 14.9 14.7 14.5 14.3 B₂O₃ 2.7 3.3 3.3 3.2 3.2 3.1 3.1 MgO 7.6 9.2 9.1 8.9 8.8 8.7 8.6 CaO 5.9 7.1 7.1 7.0 6.9 6.8 6.7 SrO 1.2 0.7 0.7 0.7 0.7 0.7 0.7 BaO 2.1 3.0 3.0 2.9 2.9 2.9 2.8 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 4.0 0.3 0.3 0.3 0.3 0.3 0.3 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.96 18.45 18.61 19.34 19.50 20.29 20.45 SrO + BaO 3.3 3.7 3.7 3.6 3.6 3.6 3.5 B₂O₃/BaO 1.3 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.6 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 24.0 21.5 21.6 22.2 22.3 22.4 23.1 (SrO + BaO) (CaO + SrO + BaO) − −5.2 −7.8 −7.6 −7.5 −7.4 −7.2 −7.2 (Al₂O₃ + B₂O₃) Thermal expansion 38.1 42.3 42.0 41.8 41.5 41.3 40.8 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.53 2.65 2.64 2.64 2.63 2.63 2.62 Strain point (° C.) 700 711 711 712 712 713 713 Annealing point 747 772 771 773 773 773 774 (° C.) Softening point 967 971 972 973 975 976 978 (° C.) 10^(4.0) dPa · s (° C.) 1,302 1,216 1,221 1,227 1,233 1,239 1,245 10^(3.0) dPa · s (° C.) 1,470 1,392 1,395 1,402 1,406 1,412 1,417 10^(2.5) dPa · s (° C.) 1,569 1,439 1,445 1,455 1,463 1,472 1,480 Young's modulus 77.3 85.7 85.7 85.3 85.1 85.0 84.8 (GPa) Specific Young's 30.6 32.4 32.5 32.4 32.4 32.4 32.4 modulus (GPa/g · cm⁻³) (mol %) No. 148 No. 149 No. 150 No. 151 No. 152 No. 153 No. 154 SiO₂ 63.9 64.4 64.9 65.4 66.4 66.9 67.4 Al₂O₃ 14.1 13.9 13.7 13.5 13.1 12.9 12.7 B₂O₃ 3.1 3.0 3.0 2.9 2.9 2.8 2.8 MgO 8.5 8.4 8.2 8.1 7.9 7.8 7.6 CaO 6.6 6.5 6.4 6.3 6.1 6.0 6.0 SrO 0.7 0.7 0.7 0.7 0.6 0.6 0.6 BaO 2.8 2.7 2.7 2.7 2.6 2.6 2.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.3 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 20.61 21.47 21.63 22.55 22.90 23.89 24.07 SrO + BaO 3.5 3.4 3.4 3.4 3.2 3.2 3.1 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + 23.2 23.9 24.0 24.1 25.8 25.8 26.7 B₂O₃)/(SrO + BaO) (CaO + SrO + BaO) − −7.1 −7.0 −6.9 −6.7 −6.7 −6.5 −6.4 (Al₂O₃ + B₂O₃) Thermal expansion 40.4 40.2 39.9 39.6 38.7 38.4 38.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.61 2.60 2.60 2.59 2.58 2.58 Strain point (° C.) 714 715 715 716 717 718 719 Annealing point 774 776 776 777 779 780 780 (° C.) Softening point 980 982 984 986 990 993 995 (° C.) 10^(4.0) dPa · s (° C.) 1,252 1,257 1,264 1,271 1,284 1,291 1,297 10^(3.0) dPa · s (° C.) 1,422 1,427 1,433 1,440 1,452 1,458 1,465 10^(2.5) dPa · s (° C.) 1,488 1,497 1,507 1,517 1,535 1,545 1,554 Young's modulus 84.6 84.4 84.1 84.0 83.5 83.3 83.1 (GPa) Specific Young's 32.4 32.4 32.3 32.3 32.3 32.3 32.3 modulus (GPa/g · cm⁻³)

TABLE 12 (mol %) No. 155 No. 156 No. 157 No. 158 No. 159 No. 160 No. 161 SiO₂ 67.9 68.4 68.9 69.4 69.9 70.4 70.9 Al₂O₃ 12.5 12.3 12.1 11.9 11.7 11.5 11.3 B₂O₃ 2.7 2.7 2.6 2.6 2.6 2.5 2.5 MgO 7.5 7.4 7.3 7.2 7.1 6.9 6.8 CaO 5.9 5.8 5.7 5.6 5.5 5.4 5.3 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.6 BaO 2.5 2.4 2.4 2.4 2.3 2.3 2.2 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 25.15 25.33 26.50 26.69 26.88 28.16 28.36 SrO + BaO 3.1 3.0 3.0 3.0 2.9 2.9 2.8 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + 26.8 27.8 27.9 28.0 29.0 29.1 30.3 B₂O₃)/(SrO + BaO) (CaO + SrO + BaO) − −6.2 −6.2 −6.0 −5.9 −5.9 −5.7 −5.7 (Al₂O₃ + B₂O₃) Thermal expansion 37.7 37.2 36.9 36.6 36.1 36.0 35.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.56 2.56 2.55 2.55 2.54 2.54 Strain point (° C.) 720 720 721 722 722 724 724 Annealing point 781 782 784 784 785 786 787 (° C.) Softening point 998 1,000 1,003 1,005 1,007 1,010 1,013 (° C.) 10^(4.0) dPa · s (° C.) 1,304 1,311 1,318 1,324 1,330 1,338 1,344 10^(3.0) dPa · s (° C.) 1,472 1,478 1,486 1,492 1,499 1,508 1,515 10^(2.5) dPa · s (° C.) 1,564 1,573 1,582 1,590 1,599 1,610 1,619 Young's modulus 82.9 82.7 82.6 82.4 82.2 81.9 81.7 (GPa) Specific Young's 32.2 32.3 32.2 32.3 32.3 32.2 32.2 modulus (GPa/g · cm⁻³) (mol %) No. 162 No. 163 No. 164 No. 165 No. 166 No. 167 No. 168 SiO₂ 69.7 69.4 69.0 68.6 68.2 67.8 67.5 Al₂O₃ 8.3 8.8 9.3 9.8 10.3 10.8 11.3 B₂O₃ 3.1 3.0 3.0 3.0 3.0 3.0 3.0 MgO 8.5 8.4 8.4 8.3 8.3 8.2 8.2 CaO 6.6 6.6 6.5 6.5 6.4 6.4 6.4 SrO 0.7 0.7 0.7 0.7 0.7 0.7 0.7 BaO 2.8 2.8 2.7 2.7 2.7 2.7 2.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.3 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.48 23.13 23.00 22.87 22.73 22.60 22.50 SrO + BaO 3.5 3.5 3.4 3.4 3.4 3.4 3.4 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + 23.2 23.2 23.9 23.9 24.0 24.0 24.1 Al₂O₃ + B₂O₃)/(SrO + BaO) (CaO + SrO + BaO) − −1.3 −1.7 −2.4 −2.9 −3.5 −4.0 −4.5 (Al₂O₃ + B₂O₃) Thermal expansion 40.7 40.6 40.4 40.2 40.0 39.9 39.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.57 2.57 2.58 2.58 2.58 2.58 Strain point (° C.) 696 695 695 694 695 697 700 Annealing point 756 757 757 758 759 761 763 (° C.) Softening point 974 975 975 975 976 977 979 (° C.) 10^(4.0) dPa · s (° C.) 1,295 1,294 1,292 1,290 1,288 1,286 1,285 10^(3.0) dPa · s (° C.) 1,465 1,465 1,465 1,464 1,462 1,461 1,458 10^(2.5) dPa · s (° C.) 1,570 1,568 1,566 1,562 1,558 1,553 1,547 Young's modulus 79.9 80.4 80.7 81.1 81.4 81.8 82.4 (GPa) Specific Young's 31.2 31.3 31.4 31.5 31.6 31.7 31.9 modulus (GPa/g · cm⁻³)

TABLE 13 (mol %) No. 169 No. 170 No. 171 No. 172 No. 173 No. 174 No. 175 SiO₂ 67.1 66.7 66.3 65.6 65.2 64.8 64.4 Al₂O₃ 11.8 12.3 12.8 13.8 14.3 14.8 15.3 B₂O₃ 2.9 2.9 2.9 2.9 2.9 2.8 2.8 MgO 8.1 8.1 8.0 8.0 7.9 7.9 7.8 CaO 6.3 6.3 6.3 6.2 6.2 6.1 6.1 SrO 0.7 0.7 0.7 0.6 0.6 0.6 0.6 BaO 2.7 2.7 2.6 2.6 2.6 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.14 23.00 22.86 22.62 22.48 23.14 23.00 SrO + BaO 3.4 3.4 3.3 3.2 3.2 3.2 3.2 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.1 24.1 24.8 25.7 25.8 25.8 25.8 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.0 −5.5 −6.1 −7.3 −7.8 −8.3 −8.8 Thermal expansion 39.6 39.5 39.3 38.8 38.7 38.6 38.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.59 2.59 2.59 2.59 2.60 2.60 2.60 Strain point (° C.) 704 708 712 721 726 730 734 Annealing point (° C.) 768 771 774 781 784 787 789 Softening point (° C.) 982 984 986 991 994 996 998 10^(4.0) dPa · s (° C.) 1,283 1,281 1,279 1,276 1,275 1,275 1,274 10^(3.0) dPa · s (° C.) 1,457 1,453 1,450 1,441 1,436 1,432 1,428 10^(2.5) dPa · s (° C.) 1,544 1,537 1,532 1,520 1,515 1,511 1,506 Young's modulus 82.6 83.1 83.4 84.3 84.6 85.0 85.3 (GPa) Specific Young's 31.9 32.1 32.2 32.5 32.6 32.7 32.8 modulus (GPa/g · cm⁻³) (mol %) No. 176 No. 177 No. 178 No. 179 No. 180 No. 181 No. 182 SiO₂ 64.0 63.6 63.3 62.9 62.5 62.1 67.6 Al₂O₃ 15.8 16.3 16.8 17.3 17.8 18.3 13.6 B₂O₃ 2.8 2.8 2.8 2.8 2.7 2.7 0.4 MgO 7.8 7.7 7.7 7.6 7.6 7.5 8.2 CaO 6.0 6.0 6.0 5.9 5.9 5.9 6.4 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.7 BaO 2.6 2.5 2.5 2.5 2.5 2.5 2.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.86 22.71 22.61 22.46 23.15 23.00 169.00 SrO + BaO 3.2 3.1 3.1 3.1 3.1 3.1 3.4 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 0.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 25.8 26.7 26.7 26.8 26.8 26.8 24.0 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −9.4 −10.0 −10.5 −11.1 −11.5 −12.0 −4.2 Thermal expansion 38.4 38.2 37.9 37.7 37.7 37.5 39.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.61 2.61 2.61 2.62 2.62 2.62 Strain point (° C.) 737 740 742 743 745 746 748 Annealing point (° C.) 790 791 791 791 791 790 805 Softening point (° C.) 999 1,001 1,002 1,003 1,005 1,006 1,024 10^(4.0) dPa · s (° C.) 1,273 1,273 1,274 1,275 1,276 1,277 1,312 10^(3.0) dPa · s (° C.) 1,422 1,418 1,413 1,410 1,406 1,402 1,473 10^(2.5) dPa · s (° C.) 1,502 1,500 1,496 1,495 1,494 1,493 1,560 Young's modulus 85.7 86.0 86.6 86.8 87.3 87.6 86.5 (GPa) Specific Young's 32.9 33.0 33.2 33.2 33.4 33.5 33.0 modulus (GPa/g · cm⁻³)

TABLE 14 (mol %) No. 183 No. 184 No. 185 No. 186 No. 187 No. 188 No. 189 SiO₂ 67.3 67.0 66.6 66.3 65.6 65.3 64.9 Al₂O₃ 13.6 13.5 13.4 13.4 13.2 13.2 13.1 B₂O₃ 0.9 1.4 1.9 2.4 3.4 3.9 4.4 MgO 8.2 8.1 8.1 8.0 8.0 7.9 7.9 CaO 6.4 6.3 6.3 6.3 6.2 6.2 6.1 SrO 0.7 0.7 0.7 0.7 0.6 0.6 0.6 BaO 2.7 2.7 2.7 2.6 2.6 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 74.78 47.86 35.05 27.63 19.29 16.74 14.75 SrO + BaO 3.4 3.4 3.4 3.3 3.2 3.2 3.2 B₂O₃/BaO 0.3 0.5 0.7 0.9 1.3 1.5 1.7 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.1 24.1 24.1 24.9 25.7 25.8 25.8 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −4.7 −5.2 −5.6 −6.2 −7.2 −7.7 −8.2 Thermal expansion 39.2 39.2 39.3 39.1 39.0 38.8 38.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.61 2.61 2.60 2.59 2.58 2.58 Strain point (° C.) 742 735 728 723 711 706 699 Annealing point (° C.) 799 794 788 783 773 768 763 Softening point (° C.) 1,016 1,009 1,001 995 982 978 972 10^(4.0) dPa · s (° C.) 1,305 1,299 1,291 1,285 1,270 1,265 1,257 10^(3.0) dPa · s (° C.) 1,467 1,463 1,457 1,451 1,440 1,434 1,428 10^(2.5) dPa · s (° C.) 1,551 1,546 1,538 1,532 1,520 1,515 1,510 Young's modulus (GPa) 86.3 85.5 84.9 84.4 83.2 82.8 82.1 Specific Young's 33.0 32.8 32.6 32.5 32.2 32.1 31.9 modulus (GPa/g · cm⁻³) (mol %) No. 190 No. 191 No. 192 No. 193 No. 194 No. 195 No. 196 SiO₂ 64.6 64.2 63.9 63.6 63.2 62.9 62.5 Al₂O₃ 13.0 13.0 12.9 12.8 12.8 12.7 12.6 B₂O₃ 4.9 5.4 5.9 6.4 6.9 7.4 7.9 MgO 7.8 7.8 7.7 7.7 7.7 7.6 7.6 CaO 6.1 6.1 6.0 6.0 6.0 5.9 5.9 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.6 BaO 2.6 2.6 2.5 2.5 2.5 2.5 2.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 13.18 11.89 10.83 9.94 9.16 8.50 7.91 SrO+BaO 3.2 3.2 3.1 3.1 3.1 3.1 3.1 B₂O₃/BaO 1.9 2.1 2.4 2.6 2.8 3.0 3.2 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 25.8 25.8 26.7 26.7 26.7 26.8 26.8 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −8.6 −9.1 −9.7 −10.1 −10.6 −11.1 −11.5 Thermal expansion 38.9 38.8 38.7 38.7 38.6 38.6 38.7 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.57 2.56 2.55 2.55 2.54 2.54 Strain point (° C.) 693 688 683 677 672 667 661 Annealing point (° C.) 758 754 750 745 740 736 731 Softening point (° C.) 967 963 960 957 954 952 950 10^(4.0) dPa · s (° C.) 1,251 1,244 1,238 1,232 1,226 1,221 1,215 10^(3.0) dPa · s (° C.) 1,423 1,415 1,410 1,404 1,397 1,392 1,386 10^(2.5) dPa · s (° C.) 1,507 1,501 1,501 1,498 1,494 1,495 1,493 Young's modulus (GPa) 81.4 81.1 80.2 79.8 79.4 78.7 78.1 Specific Young's 31.7 31.6 31.4 31.3 31.2 30.9 30.8 modulus (GPa/g · cm⁻³)

TABLE 15 (mol %) No. 197 No. 198 No. 199 No. 200 No. 201 No. 202 No. 203 SiO₂ 69.5 69.2 68.8 68.4 68.1 67.7 67.4 Al₂O₃ 14.0 14.0 13.9 13.8 13.7 13.7 13.6 B₂O₃ 3.1 3.0 3.0 3.0 3.0 3.0 3.0 MgO 3.0 3.5 4.0 4.5 5.0 5.5 6.0 CaO 6.6 6.5 6.5 6.5 6.4 6.4 6.4 SrO 0.7 0.7 0.7 0.7 0.7 0.7 0.7 BaO 2.8 2.8 2.7 2.7 2.7 2.7 2.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.42 23.07 22.93 22.80 22.70 22.57 22.47 SrO + BaO 3.5 3.5 3.4 3.4 3.4 3.4 3.4 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.7 24.6 25.2 25.1 24.9 24.8 24.7 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −7.0 −7.0 −7.0 −6.9 −6.9 −6.9 −6.8 Thermal expansion 35.6 35.8 36.2 36.7 37.0 37.3 37.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.56 2.56 2.56 2.57 2.57 2.57 2.58 Strain point (° C.) 739 738 736 734 732 730 728 Annealing point (° C.) 798 796 794 791 788 786 784 Softening point (° C.) 1,035 1,031 1,026 1,020 1,016 1,011 1,006 10^(4.0) dPa · s (° C.) 1,359 1,353 1,344 1,335 1,327 1,319 1,311 10^(3.0) dPa · s (° C.) 1,518 1,510 1,501 1,492 1,486 1,477 1,470 10^(2.5) dPa · s (° C.) 1,624 1,616 1,606 1,595 1,586 1,574 1,564 Young's modulus (GPa) 80.8 81.2 81.4 81.7 81.9 82.4 82.7 Specific Young's 31.6 31.7 31.8 31.8 31.9 32.0 32.1 modulus (GPa/g · cm⁻³) (mol %) No. 204 No. 205 No. 206 No. 207 No. 208 No. 209 No. 210 SiO₂ 67.0 66.7 66.3 65.6 65.2 64.9 64.5 Al₂O₃ 13.5 13.4 13.4 13.2 13.2 13.1 13.0 B₂O₃ 2.9 2.9 2.9 2.9 2.9 2.8 2.8 MgO 6.5 7.0 7.5 8.5 9.0 9.5 10.0 CaO 6.3 6.3 6.3 6.2 6.2 6.1 6.1 SrO 0.7 0.7 0.7 0.6 0.6 0.6 0.6 BaO 2.7 2.7 2.6 2.6 2.6 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.10 23.00 22.86 22.62 22.48 23.18 23.04 SrO + BaO 3.4 3.4 3.3 3.2 3.2 3.2 3.2 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 24.5 24.4 25.0 25.5 25.4 25.3 25.1 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.7 −6.6 −6.7 −6.7 −6.7 −6.6 −6.5 Thermal expansion 38.1 38.5 38.7 39.4 39.7 40.1 40.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.58 2.59 2.59 2.59 2.60 2.60 2.61 Strain point (° C.) 725 722 720 714 711 709 705 Annealing point (° C.) 783 781 780 776 774 774 771 Softening point (° C.) 1,002 997 993 984 980 977 972 10^(4.0) dPa · s (° C.) 1,302 1,295 1,286 1,269 1,261 1,254 1,245 10^(3.0) dPa · s (° C.) 1,465 1,459 1,451 1,440 1,433 1,429 1,422 10^(2.5) dPa · s (° C.) 1,556 1,546 1,535 1,517 1,506 1,499 1,489 Young's modulus (GPa) 82.9 83.2 83.6 84.0 84.5 84.7 84.9 Specific Young's 32.1 32.2 32.3 32.4 32.5 32.5 32.6 modulus (GPa/g · cm⁻³)

TABLE 16 (mol %) No. 211 No. 212 No. 213 No. 214 No. 215 No. 216 No. 217 SiO₂ 64.1 63.8 63.4 63.1 62.7 62.3 69.5 Al₂O₃ 12.9 12.9 12.8 12.7 12.7 12.6 14.0 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.7 3.0 MgO 10.5 11.0 11.5 12.0 12.5 13.0 8.4 CaO 6.1 6.0 6.0 6.0 5.9 5.9 1.2 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.7 BaO 2.6 2.5 2.5 2.5 2.5 2.5 2.8 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.89 22.79 22.64 22.54 22.39 23.07 23.17 SrO + BaO 3.2 3.1 3.1 3.1 3.1 3.1 3.5 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 24.9 25.6 25.5 25.4 25.2 25.0 24.7 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.4 −6.6 −6.5 −6.4 −6.5 −6.3 −12.3 Thermal expansion 41.0 41.1 41.5 41.8 42.1 42.7 31.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.61 2.62 2.62 2.62 2.63 2.55 Strain point (° C.) 702 700 698 695 694 694 745 Annealing point 768 768 765 762 760 758 801 (° C.) Softening point 968 966 962 959 957 955 1,019 (° C.) 10^(4.0) dPa · s (° C.) 1,236 1,229 1,221 1,213 1,206 1,198 1,348 10^(3.0) dPa · s (° C.) 1,415 1,410 1,404 1,398 1,392 1,386 1,509 10^(2.5) dPa · s (° C.) 1,480 1,471 1,462 1,454 1,445 1,438 1,611 Young's modulus 85.2 85.6 85.8 86.2 86.5 86.8 83.3 (GPa) Specific Young's modulus 32.6 32.7 32.8 32.9 33.0 33.0 32.7 (GPa/g · cm⁻³) (mol %) No. 218 No. 219 No. 220 No. 221 No. 222 No. 223 No. 224 SiO₂ 69.1 68.8 68.4 68.0 67.7 67.3 67.0 Al₂O₃ 13.9 13.9 13.8 13.7 13.7 13.6 13.5 B₂O₃ 3.0 3.0 3.0 3.0 3.0 3.0 2.9 MgO 8.4 8.3 8.3 8.3 8.2 8.2 8.1 CaO 1.7 2.2 2.7 3.2 3.7 4.2 4.7 SrO 0.7 0.7 0.7 0.7 0.7 0.7 0.7 BaO 2.8 2.7 2.7 2.7 2.7 2.7 2.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 23.03 22.93 22.80 22.67 22.57 22.43 23.10 SrO + BaO 3.5 3.4 3.4 3.4 3.4 3.4 3.4 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 24.6 25.2 25.1 24.9 24.8 24.7 24.5 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −11.7 −11.3 −10.7 −10.1 −9.6 −9.0 −8.3 Thermal expansion 32.6 33.1 33.9 34.6 35.2 36.0 36.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.55 2.56 2.56 2.57 2.57 2.58 Strain point (° C.) 743 741 738 735 733 730 727 Annealing point 800 798 796 794 792 789 787 (° C.) Softening point 1,015 1,013 1,009 1,006 1,004 1,000 998 (° C.) 10^(4.0) dPa · s (° C.) 1,341 1,335 1,327 1,319 1,314 1,306 1,300 10^(3.0) dPa · s (° C.) 1,498 1,491 1,482 1,474 1,469 1,463 1,460 10^(2.5) dPa · s (° C.) 1,601 1,594 1,585 1,575 1,567 1,557 1,551 Young's modulus 83.3 83.4 83.4 83.5 83.6 83.6 83.6 (GPa) Specific Young's modulus 32.7 32.7 32.6 32.6 32.6 32.5 32.4 (GPa/g · cm⁻³)

TABLE 17 (mol %) No. 225 No. 226 No. 227 No. 228 No. 229 No. 230 No. 231 SiO₂ 66.6 66.3 65.6 65.2 64.9 64.5 64.2 Al₂O₃ 13.4 13.4 13.2 13.2 13.1 13.0 12.9 B₂O₃ 2.9 2.9 2.9 2.9 2.8 2.8 2.8 MgO 8.1 8.0 8.0 7.9 7.9 7.8 7.8 CaO 5.2 5.7 6.7 7.2 7.7 8.2 8.7 SrO 0.7 0.7 0.6 0.6 0.6 0.6 0.6 BaO 2.7 2.6 2.6 2.6 2.6 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.97 22.86 22.62 22.48 23.18 23.04 22.93 SrO + BaO 3.4 3.3 3.2 3.2 3.2 3.2 3.2 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 24.4 25.0 25.5 25.4 25.3 25.1 25.0 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −7.7 −7.3 −6.2 −5.7 −5.0 −4.4 −3.8 Thermal expansion 37.7 38.3 39.8 40.5 41.4 42.3 43.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.59 2.59 2.60 2.60 2.61 2.61 2.62 Strain point (° C.) 723 721 713 710 707 702 698 Annealing point 784 782 775 771 768 764 759 (° C.) Softening point 994 992 985 982 980 977 974 (° C.) 10^(4.0) dPa · s (° C.) 1,291 1,285 1,270 1,263 1,257 1,250 1,243 10^(3.0) dPa · s (° C.) 1,455 1,451 1,441 1,436 1,432 1,426 1,420 10^(2.5) dPa · s (° C.) 1,542 1,535 1,519 1,511 1,505 1,499 1,493 Young's modulus 83.6 83.7 83.8 83.8 84.0 83.8 83.9 (GPa) Specific Young's 32.3 32.4 32.3 32.2 32.2 32.1 32.1 modulus (GPa/g · cm⁻³) (mol %) No. 232 No. 233 No. 234 No. 235 No. 236 No. 237 No. 238 SiO₂ 63.8 63.5 63.1 62.8 62.4 66.3 65.6 Al₂O₃ 12.9 12.8 12.7 12.7 12.6 13.4 13.2 B₂O₃ 2.8 2.8 2.8 2.8 2.7 2.9 2.9 MgO 7.7 7.7 7.7 7.6 7.6 8.0 8.0 CaO 9.2 9.7 10.2 10.7 11.2 6.3 6.2 SrO 0.6 0.6 0.6 0.6 0.6 0.1 1.1 BaO 2.5 2.5 2.5 2.5 2.5 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.79 22.68 22.54 22.43 23.11 22.86 22.62 SrO + BaO 3.1 3.1 3.1 3.1 3.1 2.7 3.7 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 1.0 0.7 (SiO₂ + Al₂O₃ + B₂O₃)/ 25.6 25.5 25.4 25.3 25.1 30.6 22.1 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −3.4 −2.8 −2.2 −1.7 −1.0 −7.3 −6.2 Thermal expansion 43.6 44.3 45.1 45.6 46.5 38.1 40.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.62 2.63 2.63 2.64 2.64 2.58 2.60 Strain point (° C.) 695 691 686 683 680 721 713 Annealing point 757 752 747 744 740 782 774 (° C.) Softening point 972 970 968 967 966 993 984 (° C.) 10^(4.0) dPa · s (° C.) 1,236 1,230 1,223 1,218 1,212 1,283 1,272 10^(3.0) dPa · s (° C.) 1,415 1,408 1,401 1,396 1,389 1,449 1,443 10^(2.5) dPa · s (° C.) 1,487 1,481 1,476 1,471 1,467 1,532 1,521 Young's modulus 83.9 84.1 84.1 84.2 84.3 83.9 83.6 (GPa) Specific Young's 32.0 32.0 32.0 32.0 31.9 32.5 32.1 modulus (GPa/g · cm⁻³)

TABLE 18 (mol %) No. 239 No. 240 No. 241 No. 242 No. 243 No. 244 No. 245 SiO₂ 65.3 64.9 64.6 64.3 63.9 63.6 63.3 Al₂O₃ 13.2 13.1 13.0 13.0 12.9 12.8 12.8 B₂O₃ 2.9 2.8 2.8 2.8 2.8 2.8 2.8 MgO 7.9 7.9 7.8 7.8 7.8 7.7 7.7 CaO 6.2 6.1 6.1 6.1 6.0 6.0 6.0 SrO 1.6 2.1 2.6 3.1 3.6 4.1 4.6 BaO 2.6 2.6 2.6 2.6 2.5 2.5 2.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.52 23.18 23.07 22.96 22.82 22.71 22.61 SrO + BaO 4.2 4.7 5.2 5.7 6.1 6.6 7.1 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.6 0.6 0.5 0.5 0.4 0.4 0.4 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 19.4 17.2 15.5 14.1 13.0 12.0 11.1 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.7 −5.1 −4.5 −4.0 −3.6 −3.0 −2.5 Thermal expansion 40.7 41.9 42.8 43.5 44.4 45.3 45.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.63 2.64 2.65 2.66 2.67 2.68 Strain point (° C.) 711 708 705 703 700 698 697 Annealing point 771 768 764 760 757 754 750 (° C.) Softening point 981 977 973 971 968 966 965 (° C.) 10^(4.0) dPa · s (° C.) 1,269 1,263 1,259 1,255 1,249 1,246 1,242 10^(3.0) dPa · s (° C.) 1,440 1,437 1,434 1,429 1,424 1,420 1,415 10^(2.5) dPa · s (° C.) 1,517 1,513 1,510 1,505 1,502 1,500 1,495 Young's modulus 83.6 83.3 83.1 83.3 82.9 82.7 82.9 (GPa) Specific Young's 32.0 31.7 31.5 31.4 31.2 31.0 30.9 modulus (GPa/g · cm⁻³) (mol %) No. 246 No. 247 No. 248 No. 249 No. 250 No. 251 No. 252 SiO₂ 62.9 62.6 67.6 67.3 67.0 66.6 66.3 Al₂O₃ 12.7 12.6 13.6 13.6 13.5 13.4 13.4 B₂O₃ 2.8 2.7 3.0 3.0 2.9 2.9 2.9 MgO 7.6 7.6 8.2 8.2 8.1 8.1 8.0 CaO 5.9 5.9 6.4 6.4 6.3 6.3 6.3 SrO 5.1 5.6 0.7 0.7 0.7 0.7 0.7 BaO 2.5 2.5 0.1 0.6 1.1 1.6 2.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.46 23.19 22.53 22.43 23.10 22.97 22.86 SrO + BaO 7.6 8.1 0.8 1.3 1.8 2.3 2.8 B₂O₃/BaO 1.1 1.1 30.0 5.0 2.6 1.8 1.4 BaO/(SrO + BaO) 0.3 0.3 0.1 0.5 0.6 0.7 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 10.3 9.6 105.3 64.5 46.3 36.0 29.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −2.0 −1.3 −9.4 −8.9 −8.3 −7.7 −7.2 Thermal expansion 46.9 47.8 34.1 34.9 36.0 37.1 38.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.69 2.71 2.50 2.52 2.54 2.56 2.57 Strain point (° C.) 696 696 732 729 727 723 720 Annealing point 747 745 795 792 789 785 782 (° C.) Softening point 964 963 1,003 1,002 1,000 996 993 (° C.) 10^(4.0) dPa · s (° C.) 1,237 1,234 1,294 1,291 1,289 1,284 1,282 10^(3.0) dPa · s (° C.) 1,410 1,405 1,451 1,448 1,450 1,448 1,447 10^(2.5) dPa · s (° C.) 1,495 1,493 1,544 1,538 1,538 1,533 1,529 Young's modulus 82.5 82.4 85.1 85.1 84.6 84.3 84.2 (GPa) Specific Young's 30.6 30.4 34.1 33.8 33.4 33.0 32.7 modulus (GPa/g · cm⁻³)

TABLE 19 (mol %) No. 253 No. 254 No. 255 No. 256 No. 257 No. 258 No. 259 SiO₂ 65.6 65.3 64.9 64.6 64.2 63.9 63.6 Al₂O₃ 13.2 13.2 13.1 13.0 13.0 12.9 12.8 B₂O₃ 2.9 2.9 2.8 2.8 2.8 2.8 2.8 MgO 8.0 7.9 7.9 7.8 7.8 7.8 7.7 CaO 6.2 6.2 6.1 6.1 6.1 6.0 6.0 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.6 BaO 3.1 3.6 4.1 4.6 5.1 5.6 6.1 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.62 22.52 23.18 23.07 22.93 22.82 22.71 SrO + BaO 3.7 4.2 4.7 5.2 5.7 6.2 6.7 B₂O₃/BaO 0.9 0.8 0.7 0.6 0.5 0.5 0.5 BaO/(SrO + BaO) 0.8 0.9 0.9 0.9 0.9 0.9 0.9 (SiO₂ + Al₂O₃ + B₂O₃)/ 22.1 19.4 17.2 15.5 14.0 12.8 11.8 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.2 −5.7 −5.1 −4.5 −4.0 −3.5 −2.9 Thermal expansion 40.1 41.0 42.2 43.3 44.2 45.1 46.1 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.61 2.63 2.65 2.67 2.69 2.70 2.72 Strain point (° C.) 713 711 709 706 704 703 701 Annealing point 774 771 768 764 760 757 754 (° C.) Softening point 984 981 977 974 972 970 968 (° C.) 10^(4.0) dPa · s (° C.) 1,274 1,271 1,267 1,265 1,261 1,258 1,256 10^(3.0) dPa · s (° C.) 1,444 1,442 1,440 1,437 1,433 1,429 1,425 10^(2.5) dPa · s (° C.) 1,523 1,520 1,518 1,517 1,512 1,511 1,510 Young's modulus 83.5 83.3 82.9 82.5 82.4 82.1 81.8 (GPa) Specific Young's 32.0 31.7 31.3 30.9 30.7 30.4 30.0 modulus (GPa/g · cm⁻³) (mol %) No. 260 No. 261 No. 262 No. 263 No. 264 No. 265 No. 266 SiO₂ 63.2 62.9 62.5 65.6 65.3 64.9 64.6 Al₂O₃ 12.8 12.7 12.6 13.2 13.2 13.1 13.0 B₂O₃ 2.8 2.8 2.7 2.9 2.9 2.8 2.8 MgO 7.7 7.6 7.6 8.0 7.9 7.9 7.8 CaO 6.0 5.9 5.9 6.2 6.2 6.1 6.1 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.6 BaO 6.6 7.1 7.6 2.6 2.6 2.6 2.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.2 0.2 0.2 0.7 1.2 1.7 2.2 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.57 22.46 23.15 22.62 22.52 23.18 23.07 SrO + BaO 7.2 7.7 8.2 3.2 3.2 3.2 3.2 B₂O₃/BaO 0.4 0.4 0.4 1.1 1.1 1.1 1.1 BaO/(SrO + BaO) 0.9 0.9 0.9 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 10.9 10.2 9.5 25.5 25.4 25.3 25.1 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −2.4 −1.9 −1.2 −6.7 −6.7 −6.6 −6.5 Thermal expansion 47.0 47.9 49.0 38.9 38.7 38.9 38.8 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.74 2.76 2.78 2.58 2.58 2.57 2.57 Strain point (° C.) 700 700 701 715 714 713 711 Annealing point 751 749 747 774 771 768 764 (° C.) Softening point 967 967 967 985 982 979 976 (° C.) 10^(4.0) dPa · s (° C.) 1,252 1,250 1,247 1,279 1,281 1,283 1,285 10^(3.0) dPa · s (° C.) 1,420 1,417 1,410 1,449 1,451 1,454 1,457 10^(2.5) dPa · s (° C.) 1,506 1,507 1,506 1,530 1,534 1,539 1,544 Young's modulus 81.7 81.2 80.9 83.0 82.3 81.4 80.6 (GPa) Specific Young's 29.8 29.4 29.1 32.1 32.0 31.6 31.4 modulus (GPa/g · cm⁻³)

TABLE 20 (mol %) No. 267 No. 268 No. 269 No. 270 No. 271 No. 272 No. 273 SiO₂ 64.3 63.9 63.6 63.3 63.0 62.6 63.7 Al₂O₃ 13.0 12.9 12.8 12.8 12.7 12.6 13.5 B₂O₃ 2.8 2.8 2.8 2.8 2.8 2.7 3.7 MgO 7.8 7.8 7.7 7.7 7.6 7.6 8.0 CaO 6.1 6.0 6.0 6.0 5.9 5.9 8.8 SrO 0.6 0.6 0.6 0.6 0.6 0.6 0.4 BaO 2.6 2.5 2.5 2.5 2.5 2.5 1.9 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 2.7 3.2 3.7 4.2 4.7 5.2 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 22.96 22.82 22.71 22.61 22.50 23.19 17.22 SrO + BaO 3.2 3.1 3.1 3.1 3.1 3.1 2.3 B₂O₃/BaO 1.1 1.1 1.1 1.1 1.1 1.1 1.9 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 25.0 25.7 25.5 25.5 25.3 25.1 35.2 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.5 −6.6 −6.5 −6.5 −6.5 −6.3 −6.1 Thermal expansion 38.5 38.4 38.4 38.1 38.0 38.2 41.1 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.56 2.55 2.54 2.54 2.53 2.53 2.59 Strain point (° C.) 711 709 707 706 705 704 699 Annealing point 760 757 753 749 746 743 763 (° C.) Softening point 974 971 969 968 966 965 973 (° C.) 10^(4.0) dPa · s (° C.) 1,287 1,288 1,290 1,292 1,295 1,296 1,230 10^(3.0) dPa · s (° C.) 1,458 1,459 1,461 1,461 1,463 1,462 1,409 10^(2.5) dPa · s (° C.) 1,545 1,550 1,554 1,555 1,560 1,562 1,473 Young's modulus 80.1 79.1 78.3 77.8 76.9 76.1 84.5 (GPa) Specific Young's 31.3 31.0 30.8 30.7 30.4 30.1 32.7 modulus (GPa/g · cm⁻³) (mol %) No. 274 No. 275 No. 276 No. 277 No. 278 No. 279 No. 280 SiO₂ 64.2 64.7 65.2 65.7 66.2 66.7 67.2 Al₂O₃ 13.3 13.1 12.9 12.7 12.5 12.3 12.2 B₂O₃ 3.7 3.6 3.6 3.5 3.5 3.4 3.4 MgO 7.9 7.8 7.7 7.6 7.5 7.3 7.2 CaO 8.7 8.6 8.5 8.3 8.2 8.1 8.0 SrO 0.4 0.4 0.4 0.4 0.4 0.4 0.4 BaO 1.8 1.8 1.8 1.8 1.7 1.7 1.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 17.35 17.97 18.11 18.77 18.91 19.62 19.76 SrO + BaO 2.2 2.2 2.2 2.2 2.1 2.1 2.1 B₂O₃/BaO 2.1 2.0 2.0 1.9 2.1 2.0 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/ 36.9 37.0 37.1 37.2 39.1 39.2 39.4 (SrO + BaO) (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.1 −5.9 −5.8 −5.7 −5.7 −5.5 −5.5 Thermal expansion 40.7 40.4 40.0 39.7 39.2 39.0 38.4 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.58 2.57 2.57 2.57 2.56 2.55 2.55 Strain point (° C.) 699 700 700 701 701 703 704 Annealing point 764 764 764 766 766 767 768 (° C.) Softening point 975 977 979 981 983 985 988 (° C.) 10^(4.0) dPa · s (° C.) 1,236 1,243 1,250 1,257 1,264 1,271 1,279 10^(3.0) dPa · s (° C.) 1,414 1,420 1,425 1,432 1,438 1,445 1,450 10^(2.5) dPa · s (° C.) 1,481 1,490 1,498 1,508 1,517 1,527 1,534 Young's modulus 84.3 84.2 84.0 83.7 83.5 83.2 83.2 (GPa) Specific Young's 32.7 32.7 32.7 32.6 32.7 32.6 32.7 modulus (GPa/g · cm⁻³)

TABLE 21 (mol %) No. 281 No. 282 No. 283 No. 284 No. 285 No. 286 No. 287 SiO₂ 67.7 68.2 69.2 69.7 70.2 70.7 71.2 Al₂O₃ 12.0 11.8 11.4 11.2 11.0 10.9 10.7 B₂O₃ 3.3 3.3 3.1 3.1 3.0 3.0 2.9 MgO 7.1 7.0 6.8 6.7 6.6 6.5 6.3 CaO 7.8 7.7 7.5 7.4 7.2 7.1 7.0 SrO 0.4 0.4 0.3 0.3 0.3 0.3 0.3 BaO 1.7 1.6 1.6 1.5 1.5 1.5 1.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 20.52 20.67 22.32 22.48 23.40 23.57 24.55 SrO + BaO 2.1 2.0 1.9 1.8 1.8 1.8 1.8 B₂O₃/BaO 1.9 2.1 1.9 2.1 2.0 2.0 1.9 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 39.5 41.7 44.1 46.7 46.8 47.0 47.1 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.4 −5.4 −5.1 −5.1 −5.0 −5.0 −4.8 Thermal expansion 38.1 37.6 37.1 36.6 36.4 35.9 35.8 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.54 2.53 2.52 2.52 2.51 2.51 Strain point (° C.) 705 706 708 709 710 711 713 Annealing point 770 771 774 774 776 777 779 (° C.) Softening point 990 992 997 999 1,001 1,004 1,006 (° C.) 10^(4.0) dPa · s (° C.) 1,286 1,292 1,306 1,312 1,319 1,326 1,333 10^(3.0) dPa · s (° C.) 1,458 1,464 1,478 1,485 1,493 1,499 1,508 10^(2.5) dPa · s (° C.) 1,545 1,553 1,572 1,580 1,591 1,597 1,608 Young's modulus 83.0 82.7 82.3 82.1 81.8 81.9 81.5 (GPa) Specific Young's 32.6 32.6 32.5 32.6 32.5 32.6 32.5 modulus (GPa/g · cm⁻³) (mol %) No. 288 No. 289 No. 290 No. 291 No. 292 No. 293 No. 294 SiO₂ 71.7 72.2 72.7 73.2 73.7 72.6 72.2 Al₂O₃ 10.5 10.3 10.1 9.9 9.7 6.6 7.1 B₂O₃ 2.9 2.8 2.8 2.7 2.7 3.4 3.4 MgO 6.2 6.1 6.0 5.9 5.8 7.3 7.3 CaO 6.9 6.7 6.6 6.5 6.4 8.0 8.0 SrO 0.3 0.3 0.3 0.3 0.3 0.4 0.4 BaO 1.4 1.4 1.4 1.4 1.3 1.7 1.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 24.72 25.79 25.96 27.11 27.30 21.35 21.24 SrO + BaO 1.7 1.7 1.7 1.7 1.6 2.1 2.1 B₂O₃/BaO 2.1 2.0 2.0 1.9 2.1 2.0 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 50.1 50.2 50.4 50.5 53.8 39.3 39.4 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −4.8 −4.7 −4.6 −4.4 −4.4 0.1 −0.4 Thermal expansion 35.4 35.2 34.9 34.8 34.5 39.6 39.3 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.50 2.50 2.49 2.49 2.48 2.51 2.51 Strain point (° C.) 713 715 715 717 717 689 687 Annealing point 780 782 782 784 785 755 753 (° C.) Softening point 1,008 1,010 1,011 1,014 1,016 975 976 (° C.) 10^(4.0) dPa · s (° C.) 1,339 1,345 1,351 1,357 1,362 1,309 1,309 10^(3.0) dPa · s (° C.) 1,515 1,524 1,532 1,540 1,548 1,492 1,490 10^(2.5) dPa · s (° C.) 1,616 1,626 1,633 1,641 1,648 1,587 1,585 Young's modulus 81.3 81.0 80.9 80.7 80.5 78.7 79.2 (GPa) Specific Young's 32.5 32.4 32.4 32.4 32.4 31.4 31.6 modulus (GPa/g · cm⁻³)

TABLE 22 (mol %) No. 295 No. 296 No. 297 No. 298 No. 299 No. 300 No. 301 SiO₂ 71.8 71.4 71.0 70.6 70.2 69.8 69.4 Al₂O₃ 7.6 8.1 8.6 9.1 9.6 10.1 10.6 B₂O₃ 3.3 3.3 3.3 3.3 3.3 3.3 3.2 MgO 7.2 7.2 7.1 7.1 7.1 7.0 7.0 CaO 7.9 7.9 7.9 7.8 7.8 7.7 7.7 SrO 0.4 0.4 0.4 0.4 0.4 0.4 0.4 BaO 1.7 1.7 1.7 1.6 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.76 21.64 21.52 21.39 21.27 21.15 21.69 SrO + BaO 2.1 2.1 2.1 2.0 2.0 2.0 2.0 B₂O₃/BaO 1.9 1.9 1.9 2.1 2.1 2.1 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 39.4 39.4 39.5 41.5 41.6 41.6 41.6 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −0.9 −1.4 −1.9 −2.6 −3.1 −3.7 −4.1 Thermal expansion 39.2 38.9 38.7 38.4 38.1 37.9 37.9 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.51 2.52 2.52 2.52 2.52 2.53 2.53 Strain point (° C.) 687 686 686 687 689 693 697 Annealing point 754 753 753 755 757 760 764 (° C.) Softening point 976 977 979 981 983 985 988 (° C.) 10^(4.0) dPa · s (° C.) 1,309 1,308 1,307 1,306 1,304 1,303 1,301 10^(3.0) dPa · s (° C.) 1,491 1,489 1,487 1,486 1,483 1,481 1,477 10^(2.5) dPa · s (° C.) 1,587 1,584 1,583 1,581 1,577 1,575 1,571 Young's modulus 79.4 79.9 80.2 80.5 81.1 81.3 81.8 (GPa) Specific Young's 31.6 31.7 31.8 32.0 32.1 32.2 32.3 modulus (GPa/g · cm⁻³) (mol %) No. 302 No. 303 No. 304 No. 305 No. 306 No. 307 No. 308 SiO₂ 69.1 68.3 67.9 67.5 67.1 66.7 66.3 Al₂O₃ 11.1 12.1 12.6 13.1 13.6 14.1 14.6 B₂O₃ 3.2 3.2 3.2 3.1 3.1 3.1 3.1 MgO 6.9 6.9 6.8 6.8 6.7 6.7 6.7 CaO 7.6 7.6 7.5 7.5 7.4 7.4 7.3 SrO 0.4 0.3 0.3 0.3 0.3 0.3 0.3 BaO 1.6 1.6 1.6 1.6 1.6 1.6 1.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.59 21.34 21.22 21.77 21.65 21.52 21.39 SrO + BaO 2.0 1.9 1.9 1.9 1.9 1.9 1.8 B₂O₃/BaO 2.0 2.0 2.0 1.9 1.9 1.9 2.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 41.7 44.0 44.1 44.1 44.1 44.2 46.7 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −4.7 −5.8 −6.4 −6.8 −7.4 −7.9 −8.6 Thermal expansion 37.6 37.1 37.0 37.0 36.9 36.8 36.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.53 2.54 2.54 2.54 2.55 2.55 2.55 Strain point (° C.) 702 712 717 722 727 731 735 Annealing point 768 776 780 784 787 789 792 (° C.) Softening point 992 997 1,000 1,002 1,003 1,004 1,005 (° C.) 10^(4.0) dPa · s (° C.) 1,301 1,297 1,296 1,294 1,293 1,291 1,289 10^(3.0) dPa · s (° C.) 1,476 1,466 1,462 1,457 1,453 1,447 1,442 10^(2.5) dPa · s (° C.) 1,568 1,556 1,553 1,547 1,543 1,536 1,531 Young's modulus 82.1 83.0 83.2 83.7 83.9 84.4 84.7 (GPa) Specific Young's 32.4 32.7 32.8 32.9 32.9 33.1 33.2 modulus (GPa/g · cm⁻³)

TABLE 23 (mol %) No. 309 No. 310 No. 311 No. 312 No. 313 No. 314 No. 315 SiO₂ 66.0 65.6 65.2 64.8 70.8 70.4 70.1 Al₂O₃ 15.1 15.6 16.1 16.6 12.0 11.9 11.8 B₂O₃ 3.1 3.1 3.0 3.0 0.2 0.7 1.2 MgO 6.6 6.6 6.5 6.5 7.1 7.1 7.0 CaO 7.3 7.3 7.2 7.2 7.8 7.8 7.8 SrO 0.3 0.3 0.3 0.3 0.4 0.4 0.4 BaO 1.5 1.5 1.5 1.5 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.29 21.16 21.73 21.60 354.00 100.57 58.42 SrO + BaO 1.8 1.8 1.8 1.8 2.0 2.0 2.0 B₂O₃/BaO 2.1 2.1 2.0 2.0 0.1 0.4 0.8 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 46.8 46.8 46.8 46.9 41.5 41.5 41.6 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −9.1 −9.6 −10.1 −10.6 −2.4 −2.8 −3.2 Thermal expansion 36.3 36.2 36.2 36.1 37.5 37.6 37.6 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.55 2.56 2.56 2.56 2.56 2.55 Strain point (° C.) 738 741 744 745 748 740 733 Annealing point (° C.) 793 794 795 795 809 802 795 Softening point (° C.) 1,006 1,006 1,007 1,007 1,034 1,025 1,018 10^(4.0) dPa · s (° C.) 1,289 1,288 1,288 1,287 1,342 1,333 1,327 10^(3.0) dPa · s (° C.) 1,439 1,434 1,432 1,427 1,506 1,499 1,494 10^(2.5) dPa · s (° C.) 1,527 1,521 1,520 1,515 1,606 1,597 1,591 Young's modulus 85.2 85.7 85.9 86.4 85.9 85.3 84.7 (GPa) Specific Young's 33.4 33.6 33.6 33.7 33.5 33.3 33.1 modulus (GPa/g · cm⁻³) (mol %) No. 316 No. 317 No. 318 No. 319 No. 320 No. 321 No. 322 SiO₂ 69.7 69.4 69.0 68.3 68.0 67.6 67.3 Al₂O₃ 11.8 11.7 11.7 11.5 11.5 11.4 11.4 B₂O₃ 1.7 2.2 2.7 3.7 4.2 4.7 5.2 MgO 7.0 7.0 6.9 6.9 6.8 6.8 6.8 CaO 7.7 7.7 7.6 7.6 7.5 7.5 7.4 SrO 0.4 0.4 0.4 0.3 0.3 0.3 0.3 BaO 1.6 1.6 1.6 1.6 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 41.00 31.55 25.56 18.46 16.19 14.38 12.94 SrO + BaO 2.0 2.0 2.0 1.9 1.9 1.9 1.9 B₂O₃/BaO 1.1 1.4 1.7 2.3 2.6 2.9 3.3 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 41.6 41.7 41.7 43.9 44.1 44.1 44.2 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −3.8 −4.2 −4.8 −5.7 −6.3 −6.7 −7.3 Thermal expansion 37.5 37.5 37.4 37.4 37.2 37.3 37.1 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.55 2.54 2.54 2.53 2.52 2.52 2.51 Strain point (° C.) 726 719 714 700 695 689 684 Annealing point (° C.) 789 783 778 766 762 755 751 Softening point (° C.) 1,012 1,006 1,000 988 984 978 973 10^(4.0) dPa · s (° C.) 1,319 1,313 1,306 1,291 1,286 1,279 1,274 10^(3.0) dPa · s (° C.) 1,488 1,482 1,477 1,464 1,459 1,452 1,445 10^(2.5) dPa · s (° C.) 1,583 1,575 1,569 1,556 1,552 1,545 1,540 Young's modulus 84.2 83.7 83.0 81.9 81.4 80.8 80.4 (GPa) Specific Young's 33.0 32.9 32.7 32.4 32.2 32.1 32.0 modulus (GPa/g · cm⁻³)

TABLE 24 (mol %) No. 323 No. 324 No. 325 No. 326 No. 327 No. 328 No. 329 SiO₂ 66.9 66.5 66.2 65.8 65.5 65.1 72.4 Al₂O₃ 11.3 11.2 11.2 11.1 11.1 11.0 12.2 B₂O₃ 5.7 6.2 6.7 7.2 7.7 8.2 3.4 MgO 6.7 6.7 6.7 6.6 6.6 6.5 1.9 CaO 7.4 7.4 7.3 7.3 7.2 7.2 8.0 SrO 0.3 0.3 0.3 0.3 0.3 0.3 0.4 BaO 1.6 1.6 1.5 1.5 1.5 1.5 1.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 11.74 10.73 9.88 9.14 8.51 7.94 21.29 SrO + BaO 1.9 1.9 1.8 1.8 1.8 1.8 2.1 B₂O₃/BaO 3.6 3.9 4.5 4.8 5.1 5.5 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 44.2 44.2 46.7 46.7 46.8 46.8 41.9 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −7.7 −8.1 −8.8 −9.2 −9.8 −10.2 −5.5 Thermal expansion 37.3 37.3 37.1 37.2 37.0 37.1 34.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.51 2.51 2.50 2.49 2.49 2.48 2.49 Strain point (° C.) 678 671 667 662 658 652 737 Annealing point (° C.) 745 739 736 730 727 721 798 Softening point (° C.) 968 963 960 956 953 951 1,041 10^(4.0) dPa · s (° C.) 1,267 1,261 1,256 1,250 1,246 1,241 1,377 10^(3.0) dPa · s (° C.) 1,439 1,432 1,426 1,420 1,413 1,408 1,552 10^(2.5) dPa · s (° C.) 1,537 1,533 1,529 1,527 1,525 1,524 1,656 Young's modulus 79.7 79.1 78.6 77.9 77.5 76.8 79.5 (GPa) Specific Young's 31.7 31.6 31.5 31.2 31.2 30.9 31.9 modulus (GPa/g · cm⁻³) (mol %) No. 330 No. 331 No. 332 No. 333 No. 334 No. 335 No. 336 SiO₂ 72.0 71.6 71.3 70.9 70.5 70.1 69.8 Al₂O₃ 12.2 12.1 12.0 12.0 11.9 11.8 11.8 B₂O₃ 3.4 3.3 3.3 3.3 3.3 3.3 3.3 MgO 2.4 2.9 3.4 3.9 4.4 4.9 5.4 CaO 8.0 7.9 7.9 7.8 7.8 7.8 7.7 SrO 0.4 0.4 0.4 0.4 0.4 0.4 0.4 BaO 1.7 1.7 1.7 1.7 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.18 21.70 21.61 21.48 21.36 21.24 21.15 SrO + BaO 2.1 2.1 2.1 2.1 2.0 2.0 2.0 B₂O₃/BaO 2.0 1.9 1.9 1.9 2.1 2.1 2.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 41.7 41.4 41.2 41.0 42.9 42.6 42.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.5 −5.4 −5.3 −5.4 −5.4 −5.3 −5.4 Thermal expansion 34.4 34.9 35.2 35.4 35.7 36.1 36.3 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.50 2.50 2.51 2.51 2.51 2.52 2.52 Strain point (° C.) 734 732 729 726 723 719 717 Annealing point (° C.) 795 792 789 786 783 780 779 Softening point (° C.) 1,035 1,030 1,025 1,021 1,016 1,010 1,007 10^(4.0) dPa · s (° C.) 1,369 1,362 1,354 1,347 1,338 1,329 1,323 10^(3.0) dPa · s (° C.) 1,541 1,533 1,524 1,515 1,507 1,499 1,492 10^(2.5) dPa · s (° C.) 1,645 1,638 1,628 1,619 1,609 1,599 1,590 Young's modulus 80.0 80.1 80.5 80.8 81.0 81.2 81.7 (GPa) Specific Young's 32.0 32.0 32.1 32.2 32.2 32.3 32.4 modulus (GPa/g · cm⁻³)

TABLE 25 (mol %) No. 337 No. 338 No. 339 No. 340 No. 341 No. 342 No. 343 SiO₂ 69.4 69.0 68.3 67.9 67.6 67.2 66.8 Al₂O₃ 11.7 11.7 11.5 11.5 11.4 11.4 11.3 B₂O₃ 3.2 3.2 3.2 3.2 3.1 3.1 3.1 MgO 5.9 6.4 7.4 7.9 8.4 8.9 9.4 CaO 7.7 7.6 7.6 7.5 7.5 7.4 7.4 SrO 0.4 0.4 0.3 0.3 0.3 0.3 0.3 BaO 1.6 1.6 1.6 1.6 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.69 21.56 21.34 21.22 21.81 21.68 21.55 SrO + BaO 2.0 2.0 1.9 1.9 1.9 1.9 1.9 B₂O₃/BaO 2.0 2.0 2.0 2.0 1.9 1.9 1.9 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 42.2 42.0 43.7 43.5 43.2 43.0 42.7 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.2 −5.3 −5.2 −5.3 −5.1 −5.2 −5.1 Thermal expansion 36.8 37.1 37.8 38.0 38.5 38.8 39.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.53 2.53 2.54 2.54 2.55 2.55 2.56 Strain point (° C.) 713 711 703 700 698 695 692 Annealing point (° C.) 776 775 769 768 766 764 761 Softening point (° C.) 1,003 999 990 986 983 979 975 10^(4.0) dPa · s ( ° C.) 1,315 1,307 1,290 1,282 1,275 1,267 1,258 10^(3.0) dPa · s ( ° C.) 1,485 1,478 1,464 1,457 1,451 1,444 1,436 10^(2.5) dPa · s ( ° C.) 1,581 1,572 1,553 1,544 1,536 1,527 1,517 Young's modulus (GPa) 81.9 82.2 82.7 83.1 83.4 83.7 84.0 Specific Young's 32.4 32.5 32.6 32.7 32.8 32.8 32.9 modulus (GPa/g · cm⁻³) (mol %) No. 344 No. 345 No. 346 No. 347 No. 348 No. 349 No. 350 SiO₂ 66.5 66.1 65.7 65.3 65.0 72.4 72.0 Al₂O₃ 11.2 11.2 11.1 11.0 11.0 12.2 12.2 B₂O₃ 3.1 3.1 3.1 3.0 3.0 3.4 3.4 MgO 9.9 10.4 10.9 11.4 11.9 7.3 7.2 CaO 7.4 7.3 7.3 7.2 7.2 2.6 3.1 SrO 0.3 0.3 0.3 0.3 0.3 0.4 0.4 BaO 1.5 1.5 1.5 1.5 1.5 1.7 1.7 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.45 21.32 21.19 21.77 21.67 21.29 21.18 SrO + BaO 1.8 1.8 1.8 1.8 1.8 2.1 2.1 B₂O₃/BaO 2.1 2.1 2.1 2.0 2.0 2.0 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 44.9 44.7 44.4 44.1 43.9 41.9 41.7 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.1 −5.2 −5.1 −5.0 −5.0 −10.9 −10.4 Thermal expansion 39.5 39.8 40.2 40.8 41.0 30.7 31.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.56 2.56 2.56 2.57 2.57 2.48 2.49 Strain point (° C.) 690 688 686 686 686 738 735 Annealing point (° C.) 759 757 754 753 751 800 798 Softening point (° C.) 972 969 966 964 962 1,025 1,022 10^(4.0) dPa · s ( ° C.) 1,250 1,242 1,233 1,225 1,218 1,372 1,365 10^(3.0) dPa · s ( ° C.) 1,430 1,424 1,416 1,410 1,404 1,543 1,533 10^(2.5) dPa · s ( ° C.) 1,509 1,501 1,492 1,485 1,476 1,648 1,640 Young's modulus (GPa) 84.3 84.6 84.9 85.0 85.6 82.0 82.0 Specific Young's 33.0 33.1 33.1 33.0 33.2 33.0 33.0 modulus (GPa/g · cm⁻³)

TABLE 26 (mol %) No. 351 No. 352 No. 353 No. 354 No. 355 No. 356 No. 357 SiO₂ 71.6 71.3 70.9 70.5 70.2 69.8 69.4 Al₂O₃ 12.1 12.0 12.0 11.9 11.9 11.8 11.7 B₂O₃ 3.3 3.3 3.3 3.3 3.3 3.3 3.2 MgO 7.2 7.2 7.1 7.1 7.0 7.0 7.0 CaO 3.6 4.1 4.6 5.1 5.6 6.1 6.6 SrO 0.4 0.4 0.4 0.4 0.4 0.4 0.4 BaO 1.7 1.7 1.7 1.6 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.70 21.61 21.48 21.36 21.27 21.15 21.69 SrO + BaO 2.1 2.1 2.1 2.0 2.0 2.0 2.0 B₂O₃/BaO 1.9 1.9 1.9 2.1 2.1 2.1 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 41.4 41.2 41.0 42.9 42.7 42.5 42.2 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −9.7 −9.1 −8.6 −8.1 −7.6 −7.0 −6.3 Thermal expansion 32.0 32.6 33.2 33.8 34.3 35.1 36.0 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.49 2.50 2.50 2.51 2.51 2.52 2.52 Strain point (° C.) 733 730 727 724 721 717 714 Annealing point 796 793 791 788 786 782 779 (° C.) Softening point 1,019 1,016 1,014 1,010 1,008 1,004 1,001 (° C.) 10^(4.0) dPa · s (° C.) 1,357 1,350 1,343 1,335 1,329 1,321 1,313 10^(3.0) dPa · s (° C.) 1,522 1,514 1,506 1,499 1,493 1,486 1,482 10^(2.5) dPa · s (° C.) 1,631 1,622 1,613 1,604 1,596 1,587 1,579 Young's modulus 82.1 82.2 82.2 82.2 82.4 82.4 82.4 (GPa) Specific Young's 32.9 32.9 32.8 32.8 32.8 32.7 32.6 modulus (GPa/g · cm⁻³) (mol %) No. 358 No. 359 No. 360 No. 361 No. 362 No. 363 No. 364 SiO₂ 69.0 68.3 67.9 67.6 67.2 66.8 66.4 Al₂O₃ 11.7 11.5 11.5 11.4 11.3 11.3 11.2 B₂O₃ 3.2 3.2 3.2 3.1 3.1 3.1 3.1 MgO 6.9 6.9 6.8 6.8 6.8 6.7 6.7 CaO 7.1 8.1 8.6 9.1 9.6 10.1 10.6 SrO 0.4 0.3 0.3 0.3 0.3 0.3 0.3 BaO 1.6 1.6 1.6 1.6 1.6 1.6 1.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.56 21.34 21.22 21.81 21.68 21.55 21.42 SrO + BaO 2.0 1.9 1.9 1.9 1.9 1.9 1.8 B₂O₃/BaO 2.0 2.0 2.0 1.9 1.9 1.9 2.1 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 42.0 43.7 43.5 43.2 42.9 42.7 44.8 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −5.8 −4.7 −4.2 −3.5 −2.9 −2.4 −1.9 Thermal expansion 36.7 38.2 38.9 39.7 40.6 41.4 42.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.53 2.54 2.54 2.55 2.56 2.56 2.57 Strain point (° C.) 711 702 699 696 691 688 684 Annealing point 776 768 764 761 756 753 748 (° C.) Softening point 998 991 988 985 982 980 977 (° C.) 10^(4.0) dPa · s (° C.) 1,306 1,291 1,285 1,279 1,271 1,265 1,258 10^(3.0) dPa · s (° C.) 1,476 1,465 1,459 1,454 1,446 1,440 1,432 10^(2.5) dPa · s (° C.) 1,570 1,555 1,547 1,541 1,534 1,528 1,522 Young's modulus 82.4 82.5 82.6 82.7 82.7 82.8 82.7 (GPa) Specific Young's 32.6 32.5 32.4 32.4 32.4 32.3 32.2 modulus (GPa/g · cm⁻³)

TABLE 27 (mol %) No. 365 No. 366 No. 367 No. 368 No. 369 No. 370 No. 371 SiO₂ 66.1 65.7 65.3 65.0 68.3 68.0 67.6 Al₂O₃ 11.2 11.1 11.0 11.0 11.5 11.5 11.4 B₂O₃ 3.1 3.1 3.0 3.0 3.2 3.2 3.2 MgO 6.6 6.6 6.6 6.5 6.9 6.8 6.8 CaO 11.1 11.6 12.1 12.6 7.6 7.5 7.5 SrO 0.3 0.3 0.3 0.3 0.9 1.4 1.9 BaO 1.5 1.5 1.5 1.5 1.6 1.6 1.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.32 21.19 21.77 21.67 21.34 21.25 21.13 SrO + BaO 1.8 1.8 1.8 1.8 2.5 3.0 3.5 B₂O₃/BaO 2.1 2.1 2.0 2.0 2.0 2.0 2.0 BaO/(SrO + BaO) 0.8 0.8 0.8 0.8 0.6 0.5 0.5 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 44.7 44.4 44.1 43.9 33.2 27.6 23.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −1.4 −0.8 −0.1 0.4 −4.6 −4.2 −3.6 Thermal expansion 42.8 43.6 44.6 45.2 38.4 39.1 40.2 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.57 2.57 2.58 2.59 2.55 2.56 2.57 Strain point (° C.) 681 676 673 670 702 700 696 Annealing point 745 740 736 733 767 764 760 (° C.) Softening point 976 974 973 972 989 986 981 (° C.) 10^(4.0) dPa · s (° C.) 1,254 1,247 1,241 1,237 1,293 1,290 1,285 10^(3.0) dPa · s (° C.) 1,427 1,419 1,411 1,405 1,466 1,464 1,458 10^(2.5) dPa · s (° C.) 1,517 1,511 1,507 1,503 1,556 1,553 1,547 Young's modulus 82.9 82.9 82.9 83.1 82.4 82.3 82.2 (GPa) Specific Young's 32.3 32.2 32.1 32.1 32.4 32.2 32.0 modulus (GPa/g · cm⁻³) (mol %) No. 372 No. 373 No. 374 No. 375 No. 376 No. 377 No. 378 SiO₂ 67.3 66.9 66.6 66.3 65.9 65.6 65.2 Al₂O₃ 11.4 11.3 11.3 11.2 11.1 11.1 11.0 B₂O₃ 3.1 3.1 3.1 3.1 3.1 3.1 3.0 MgO 6.8 6.7 6.7 6.7 6.6 6.6 6.6 CaO 7.4 7.4 7.4 7.3 7.3 7.3 7.2 SrO 2.4 2.9 3.4 3.9 4.4 4.9 5.4 BaO 1.6 1.6 1.6 1.5 1.5 1.5 1.5 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.71 21.58 21.48 21.39 21.26 21.16 21.73 SrO + BaO 4.0 4.5 5.0 5.4 5.9 6.4 6.9 B₂O₃/BaO 1.9 1.9 1.9 2.1 2.1 2.1 2.0 BaO/(SrO + BaO) 0.4 0.4 0.3 0.3 0.3 0.2 0.2 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 20.5 18.1 16.2 14.9 13.6 12.5 11.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −3.1 −2.5 −2.0 −1.6 −1.0 −0.5 0.1 Thermal expansion 41.0 42.1 42.9 43.6 44.7 45.4 46.5 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.58 2.59 2.60 2.61 2.63 2.64 2.65 Strain point (° C.) 695 692 690 689 687 687 688 Annealing point 758 754 751 748 745 742 741 (° C.) Softening point 979 976 974 972 971 970 969 (° C.) 10^(4.0) dPa · s (° C.) 1,281 1,277 1,273 1,269 1,264 1,261 1,257 10^(3.0) dPa · s (° C.) 1,455 1,449 1,444 1,440 1,434 1,428 1,422 10^(2.5) dPa · s (° C.) 1,544 1,540 1,535 1,533 1,530 1,526 1,525 Young's modulus 82.2 81.9 82.0 81.8 81.5 81.7 81.4 (GPa) Specific Young's 31.8 31.5 31.5 31.3 31.0 31.0 30.7 modulus (GPa/g · cm⁻³)

TABLE 28 (mol %) No. 379 No. 380 No. 381 No. 382 No. 383 No. 384 No. 385 SiO₂ 69.7 69.4 69.0 68.3 68.0 67.6 67.3 Al₂O₃ 11.8 11.7 11.7 11.5 11.5 11.4 11.4 B₂O₃ 3.2 3.2 3.2 3.2 3.2 3.2 3.1 MgO 7.0 7.0 6.9 6.9 6.8 6.8 6.8 CaO 7.7 7.7 7.6 7.6 7.5 7.5 7.4 SrO 0.4 0.4 0.4 0.3 0.3 0.3 0.3 BaO 0.1 0.6 1.1 2.1 2.6 3.1 3.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.78 21.69 21.56 21.34 21.25 21.13 21.71 SrO + BaO 0.5 1.0 1.5 2.4 2.9 3.4 3.9 B₂O₃/BaO 32.0 5.3 2.9 1.5 1.2 1.0 0.9 BaO/(SrO + BaO) 0.2 0.6 0.7 0.9 0.9 0.9 0.9 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 169.4 84.3 55.9 34.6 28.5 24.2 21.0 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −6.8 −6.2 −5.8 −4.7 −4.3 −3.7 −3.2 Thermal expansion 34.6 35.5 36.4 38.4 39.3 40.5 41.4 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.48 2.50 2.52 2.55 2.57 2.59 2.61 Strain point (° C.) 718 714 711 703 701 697 697 Annealing point (° C.) 785 780 777 767 765 760 758 Softening point (° C.) 1,006 1,002 999 990 987 982 980 10^(4.0) dPa · s (° C.) 1,309 1,306 1,303 1,295 1,293 1,288 1,287 10^(3.0) dPa · s (° C.) 1,476 1,474 1,473 1,468 1,466 1,462 1,459 10^(2.5) dPa · s (° C.) 1,574 1,569 1,567 1,558 1,557 1,552 1,550 Young's modulus (GPa) 83.3 83.2 82.8 82.2 81.9 81.6 81.5 Specific Young's 33.6 33.3 32.9 32.2 31.9 31.5 31.2 modulus (GPa/g · cm⁻³) (mol %) No. 386 No. 387 No. 388 No. 389 No. 390 No. 391 SiO₂ 66.9 66.6 66.2 65.9 65.5 65.2 Al₂O₃ 11.3 11.2 11.2 11.1 11.1 11.0 B₂O₃ 3.1 3.1 3.1 3.1 3.1 3.0 MgO 6.7 6.7 6.7 6.6 6.6 6.5 CaO 7.4 7.4 7.3 7.3 7.3 7.2 SrO 0.3 0.3 0.3 0.3 0.3 0.3 BaO 4.1 4.6 5.1 5.6 6.1 6.6 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 P₂O₅ 0.0 0.0 0.0 0.0 0.0 0.0 SnO₂ 0.1 0.1 0.1 0.1 0.1 0.1 SiO₂/B₂O₃ 21.58 21.48 21.35 21.26 21.13 21.73 SrO + BaO 4.4 4.9 5.4 5.9 6.4 6.9 B₂O₃/BaO 0.8 0.7 0.6 0.6 0.5 0.5 BaO/(SrO + BaO) 0.9 0.9 0.9 0.9 1.0 1.0 (SiO₂ + Al₂O₃ + B₂O₃)/(SrO + BaO) 18.5 16.5 14.9 13.6 12.5 11.5 (CaO + SrO + BaO) − (Al₂O₃ + B₂O₃) −2.6 −2.0 −1.6 −1.0 −0.5 0.1 Thermal expansion 42.6 43.6 44.6 45.6 46.6 47.7 coefficient (10⁻⁷/° C.) Density (g/cm³) 2.63 2.65 2.67 2.68 2.70 2.72 Strain point (° C.) 694 692 692 692 692 694 Annealing point (° C.) 755 751 749 747 745 745 Softening point (° C.) 977 975 973 972 972 972 10^(4.0) dPa · s (° C.) 1,283 1,280 1,277 1,275 1,272 1,271 10^(3.0) dPa · s (° C.) 1,455 1,450 1,445 1,440 1,434 1,430 10^(2.5) dPa · s (° C.) 1,548 1,545 1,542 1,541 1,537 1,538 Young's modulus (GPa) 81.0 80.8 80.6 80.3 80.2 79.7 Specific Young's 30.8 30.5 30.2 29.9 29.7 29.2 modulus (GPa/g · cm⁻³)

First, a glass batch prepared by blending glass raw materials so as to achieve the glass composition shown in each table was loaded in a platinum crucible, and then melted at from 1,600° C. to 1,650° C. for 24 hours. In melting the glass batch, molten glass was stirred to be homogenized by using a platinum stirrer. Next, the molten glass was poured on a carbon sheet and formed into a sheet shape, followed by being annealed at a temperature around an annealing point for 30 minutes. Each of the resultant samples was evaluated for its thermal expansion coefficient, density, strain point, annealing point, softening point, temperature at a viscosity at high temperature of 10^(4.0) dPa·s, temperature at a viscosity at high temperature of 10^(3.0) dPa·s, temperature at a viscosity at high temperature of 10^(2.5) dPa·s, Young's modulus, and specific Young's modulus. Part of the glass characteristics are not actually measured values but estimate values calculated from the previous data.

The thermal expansion coefficient is a value obtained by measuring an average thermal expansion coefficient within a temperature range of from 30° C. to 380° C. with a dilatometer.

The density is a value measured by a well-known Archimedes method.

The strain point, the annealing point, and the softening point are values measured in accordance with methods specified in ASTM C336 and C338.

The temperatures at viscosities at high temperature of 10^(4.0) dPa·s, 10^(3.0) dPa·s, and 10^(2.5) dPa·s are values measured by a platinum sphere pull up method.

The Young's modulus is a value measured by a flexural resonance method.

The specific Young's modulus is a value obtained by dividing the Young's modulus by the density.

As apparent from the tables, each of Sample Nos. 1 to 391, which was free of Y₂O₃ and La₂O₃ in its glass composition, had a strain point of 650° C. or more. Accordingly, each of Sample Nos. 1 to 391 may be suitable as a substrate for forming a TFT circuit in a flat panel display, such as a liquid crystal display or an OLED display, or as a carrier glass for holding a resin substrate for forming the TFT circuit. 

1. An alkali-free glass sheet, comprising as a glass composition, in terms of mol %, 60% to 74% of SiO₂, 6% to 20% of Al₂O₃, 0% to 9% of B₂O₃, 1% to 13% of MgO, 1% to 13% of CaO, 0% to 7% of SrO, 0% to 8% of BaO, and 0% to less than 1.0% of Y₂O₃+La₂O₃, being substantially free of an alkali metal oxide, and having a strain point of 650° C. or more.
 2. The alkali-free glass sheet according to claim 1, wherein the alkali-free glass sheet has a content of SrO+BaO of from 0 mol % to 3 mol %.
 3. The alkali-free glass sheet according to claim 1, wherein the alkali-free glass sheet has a strain point of 700° C. or more.
 4. The alkali-free glass sheet according to claim 1, wherein the alkali-free glass sheet has a Young's modulus of 79 GPa or more.
 5. The alkali-free glass sheet according to claim 1, wherein the alkali-free glass sheet has a thermal expansion coefficient of from 30×10⁻⁷/° C. to 45×10⁻⁷/° C.
 6. The alkali-free glass sheet according to claim 1, wherein the alkali-free glass sheet has a temperature at a viscosity at high temperature of 10^(2.5) dPa·s of 1,600° C. or less. 